{"id":10919,"date":"2026-10-15T19:29:00","date_gmt":"2026-10-15T19:29:00","guid":{"rendered":"https:\/\/bioprofile.com\/?p=10919"},"modified":"2026-10-15T19:36:42","modified_gmt":"2026-10-15T19:36:42","slug":"biorhythm-half-hour-sleep","status":"publish","type":"post","link":"https:\/\/bioprofile.com\/en\/biorhythm-half-hour-sleep\/","title":{"rendered":"Your biorhythm: why the same half hour of sleep carries a different weight"},"content":{"rendered":"\n<article class=\"wp-block-group bp-blog is-layout-flow wp-block-group-is-layout-flow\">\n\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n<link rel=\"stylesheet\" href=\"https:\/\/fonts.googleapis.com\/css2?family=Poppins:wght@300;400;500;600;700&#038;display=swap\">\n<style id=\"bp-blog-design\">\n.bp-blog {\n  --bp-ink: #212527; --bp-teal: #005859; --bp-teal-deep: #006B62; --bp-emerald: #228A62;\n  --bp-green: #7CA74D; --bp-lime: #B7CB33; --bp-lime-soft: #B7CB3329; --bp-green-aa: #4F6B28;\n  --bp-beige: #EDEAE5; --bp-sand: #DBD4CB; --bp-pale-teal: #D9E6E6; --bp-white: #FFFFFF;\n  --bp-foot: #6b6b6b;\n  --bp-font: 'Poppins','Segoe UI',Arial,sans-serif;\n  --bp-fs-h1: 40px; --bp-fs-h2: 29px; --bp-fs-h3: 21px; --bp-fs-body: 17px;\n  --bp-fs-lead: 19px; --bp-fs-small: 14px; --bp-fs-foot: 13px; --bp-fs-btn: 17px;\n  --bp-lh-body: 1.75;\n  --bp-s-2: 8px; --bp-s-3: 12px; --bp-s-4: 16px; --bp-s-5: 24px; --bp-s-6: 32px;\n  --bp-s-7: 44px; --bp-s-8: 72px;\n  --bp-measure: 875px; --bp-prose: 875px; --bp-side: 40px; --bp-portrait: 132px;\n  --bp-radius-card: 20px; --bp-radius-btn: 10px; --bp-radius-chip: 999px;\n  --bp-shadow: 0 10px 30px rgba(0,88,89,0.10); --bp-shadow-soft: 0 2px 10px rgba(0,88,89,0.06);\n  font-family: var(--bp-font); font-size: var(--bp-fs-body); line-height: var(--bp-lh-body);\n  color: var(--bp-ink); background: var(--bp-white); -webkit-font-smoothing: antialiased;\n}\n.bp-blog, .bp-blog * { box-sizing: border-box; }\n.bp-blog p, .bp-blog li, .bp-blog h1, .bp-blog h2, .bp-blog h3, .bp-blog a, .bp-blog td,\n.bp-blog th, .bp-blog cite { overflow-wrap: break-word; min-width: 0; }\n.bp-blog h1, .bp-blog h2, .bp-blog h3 { text-wrap: balance; }\n.bp-blog p, .bp-blog li { text-wrap: pretty; }\n\/* WordPress core's flow layout puts 24px above every child after the first; inside\n   a grid or a flex row that is a misalignment (measured on the scan pages 2026-08-21) *\/\n.bp-blog .bp-blog-author > *, .bp-blog .bp-blog-related > *, .bp-blog .bp-blog-verify > * { margin-block: 0; }\n\n\/* --- sections: one column, the article measure, the section rhythm ------------ *\/\n.bp-blog-sec { position: relative; background: var(--bp-white); margin-block: 0;\n  padding-block: var(--bp-s-7);\n  padding-inline: max(var(--bp-side), calc((100% - var(--bp-measure)) \/ 2)); }\n.bp-blog-sec > *:last-child { margin-block-end: 0; }\n.bp-blog-sec > p, .bp-blog-sec > ul, .bp-blog-sec > ol, .bp-blog-sec > .wp-block-quote,\n.bp-blog-sec > .bp-blog-faq-item, .bp-blog-sec > .bp-blog-takeaways, .bp-blog-sec > .bp-blog-toc,\n.bp-blog-sec > .bp-blog-refs, .bp-blog-sec > .bp-blog-srclead { max-width: var(--bp-prose); }\n.bp-blog-sec--head { padding-block: var(--bp-s-7) 0; }\n.bp-blog-sec--body { padding-block: var(--bp-s-6) var(--bp-s-7); }\n.bp-blog-sec--beige { background: var(--bp-beige); }\n.bp-blog-sec--wash { background: linear-gradient(180deg, #B7CB331A 0%, #B7CB330D 100%), #FFFFFF; }\n.bp-blog-sec--tight { padding-block: var(--bp-s-6); }\n\/* A COLOURED SECTION IS A PANEL, so it carries the panel radius. 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In 68,995 adults, what half an hour less sleep went together with depended on the sleep people were already getting, and so did how much that time counts.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup><\/li>\n\n\n<li>In people who already slept enough, swapping half an hour of sleep for standing or moving went together with a slightly lower risk of dying. In short sleepers, giving up sleep for sitting, standing or light activity went together with a slightly higher risk of dying from a disease of the heart and blood vessels.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup><\/li>\n\n\n<li><a href=\"https:\/\/bioprofile.com\/en\/sleep-test\/\">The sleep scan<\/a> gives you a first picture of how your nights go, as a starting point. The scan is not a diagnosis.<\/li>\n\n<\/ul>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-toc is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-blog-toclabel wp-block-paragraph\">Contents<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n\n<li><a href=\"#als-de-avond-de-nacht-opeet\">When the evening eats into the night<\/a><\/li>\n\n\n<li><a href=\"#een-groot-deel-van-ieders-dag\">A large part of everyone&#8217;s day<\/a><\/li>\n\n\n<li><a href=\"#wat-al-bekend-was-over-slaap-zitten-en-bioritme\">What was already known about sleep, sitting and biorhythm<\/a><\/li>\n\n\n<li><a href=\"#nieuw-onderzoek-de-hele-dag-tegelijk\">New research: the whole day at once<\/a><\/li>\n\n\n<li><a href=\"#je-dag-is-een-budget-van-24-uur\">Your day is a budget of 24 hours<\/a><\/li>\n\n\n<li><a href=\"#wat-de-studie-niet-liet-zien\">What the study did not show<\/a><\/li>\n\n\n<li><a href=\"#wat-je-hiermee-kunt\">What you can do with this<\/a><\/li>\n\n\n<li><a href=\"#veelgestelde-vragen\">Frequently asked questions<\/a><\/li>\n\n<\/ol>\n\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"als-de-avond-de-nacht-opeet\">When the evening eats into the night<\/h2>\n\n\n\n<p class=\"bp-blog-lead wp-block-paragraph\">You meant to go to bed on time tonight. Then there was still the washing-up, a message that needed an answer and an episode that ended at the most gripping moment, and the evening quietly ran on into the night. The alarm still goes off at the usual time. You get through the morning on coffee, sit at your desk in the afternoon, sit again on the way home and tell yourself the weekend will make up for the lost sleep. On Saturday you stay up late, on Sunday you sleep in, and on Monday your body clock seems to live in a different time zone from your diary.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Most advice keeps the parts of that day separate: sleep more, sit less, move more. But every part comes out of the same 24 hours, and every minute you give to one is a minute you take from another. That pattern is your biorhythm: the shape your body&#8217;s day takes, from the moment you fall asleep through to the hours in which you sit, stand and move. This background article is about what happens when half an hour shifts within that rhythm, and why a new study suggests that the answer depends on how much you already sleep.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"een-groot-deel-van-ieders-dag\">A large part of everyone&#8217;s day<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The sources for this article contain no official Dutch count of sleep time, but the German Federal Statistical Office does keep one. Destatis reported in 2024 that people in Germany slept an average of 8 hours and 37 minutes a day in 2022.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">2<\/a><\/sup> In the same 2024 publication, Destatis wrote that this was 8 minutes more than ten years earlier.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">2<\/a><\/sup> Destatis also reported in 2024 that couples with children at home sleep an average of 19 minutes a day less than couples without children at home.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">2<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Those figures tell you two things. Sleep fills more than a third of an average day, so whatever you add to your evening usually comes out of the night. And you are not the only one making that trade. In households with children, the rest of life takes sleep minutes away every day on average. If everything else keeps squeezing your nights, you are one of many.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">How much of your night is deep sleep is a separate question, covered in <a href=\"https:\/\/bioprofile.com\/hoeveel-diepe-slaap-per-nacht\/\">how much deep sleep you get per night<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"wat-al-bekend-was-over-slaap-zitten-en-bioritme\">What was already known about sleep, sitting and biorhythm<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large bp-blog-partfig\"><img decoding=\"async\" width=\"1200\" height=\"630\" src=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/10\/bp-blog-bioritme-half-uur-slaap-s3-14e93827.webp\" alt=\"Two colleagues in their fifties laughing as they take the stairs during an afternoon break in a bright office with plants.\" class=\"wp-image-10865\" srcset=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/10\/bp-blog-bioritme-half-uur-slaap-s3-14e93827.webp 1200w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/10\/bp-blog-bioritme-half-uur-slaap-s3-14e93827-300x158.webp 300w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/10\/bp-blog-bioritme-half-uur-slaap-s3-14e93827-1024x538.webp 1024w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/10\/bp-blog-bioritme-half-uur-slaap-s3-14e93827-768x403.webp 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Why does the day keep shifting? Because the day cannot get any longer. Work, travel, family and screens all claim hours, and the morning usually starts at a fixed time, so the evening stretches and the night shrinks. You may notice it when you wake up without feeling rested; that is what <a href=\"https:\/\/bioprofile.com\/en\/why-you-wake-up-tired\/\">why you wake up tired<\/a> is about.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Research had already looked at this rhythm in large groups. The UK Biobank is a large British cohort of research participants. Among the participants whose sleep was measured with a small wearable device, a regular sleep-wake rhythm went together with a lower risk of dying, and regularity predicted that risk better than the number of hours slept.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">3<\/a><\/sup> A separate analysis of the same cohort found that irregular sleep-wake patterns are linked to a higher risk of dying.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">4<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Standing has a story of its own. In UK Biobank data collected with a small wearable device, the unfavourable links of time people spent standing still or sitting came mainly from the sitting. More standing in place of sitting did not go together with better heart and blood vessel health.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">5<\/a><\/sup> So standing is not simply the opposite of sitting.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Earlier research had also linked shifting time between sleep, sitting, standing and activity to the risk of dying early. What remained unclear was whether those links are the same for everyone, or whether they change with how long and how regularly someone sleeps.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup> That is where the knowledge stopped.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"nieuw-onderzoek-de-hele-dag-tegelijk\">New research: the whole day at once<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">On 7 October 2026, the American Journal of Epidemiology published a study aimed squarely at that gap in our knowledge.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup> The study comes from the Mackenzie Wearables Research Hub at the Charles Perkins Centre and the School of Health Sciences at the University of Sydney. First author W. Bian and co-authors M.N. Ahmadi, N.A. Koemel and E. Stamatakis work there, and Ahmadi, Koemel and Stamatakis are also affiliated with the Turner Institute for Brain and Mental Health at Monash University in Melbourne. The other authors are R.K. Biswas of the School of Health Sciences at the University of Sydney; J.J. Mitchell, J.M. Blodgett and M. Hamer of UCL in London; D. Dumuid of the University of South Australia; S.F.M. Chastin of Glasgow Caledonian University and Universiteit Gent; and J.P. Chaput of the University of Ottawa and the Children&#8217;s Hospital of Eastern Ontario Research Institute. The article appeared in a scientific journal and is not a preprint.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Why does this matter to you? If you try to fit more movement into a full day, the time has to come from somewhere, and the night is the obvious place. Advice to move more rarely says what you should give up to do it. This study asks that question directly. It asks it separately for people who sleep enough and people who sleep little, and for people with regular and people with irregular sleep. The answer suggests that the same half hour can count differently, depending on the night it comes from.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"je-dag-is-een-budget-van-24-uur\">Your day is a 24-hour budget<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large bp-blog-partfig\"><img decoding=\"async\" width=\"1200\" height=\"630\" src=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/10\/bp-blog-bioritme-half-uur-slaap-s5-2158e78a.webp\" alt=\"A person in their fifties in a smart wool coat, smiling while cycling along a canal on a clear morning.\" class=\"wp-image-10867\" srcset=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/10\/bp-blog-bioritme-half-uur-slaap-s5-2158e78a.webp 1200w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/10\/bp-blog-bioritme-half-uur-slaap-s5-2158e78a-300x158.webp 300w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/10\/bp-blog-bioritme-half-uur-slaap-s5-2158e78a-1024x538.webp 1024w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/10\/bp-blog-bioritme-half-uur-slaap-s5-2158e78a-768x403.webp 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The one idea you really need to grasp here is the closed day. You cannot add time to anything without taking it away from something else. A study that only asks whether exercise is good for you compares people whose extra exercise time came from somewhere, and can leave open where that time came from. The researchers in this study took the opposite route. They looked at the day as five parts that always add up to 24 hours: sleep, sitting, standing, light activity and moderate to vigorous activity. All five were measured with a small wearable device rather than reported from memory.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup> Light activity is gentle movement, such as pottering around the house. Moderate to vigorous activity is the kind of movement that makes you breathe faster, such as brisk walking.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The statistical method the researchers used is designed for parts of a whole. It does not ask what more sitting does on its own. It asks what goes together with shifting a fixed amount of time, here 30 minutes, from one part to another while the rest of the day stays as it is. The method then compares the risk of dying in the years that follow. It is a comparison between people whose days had a different shape. It is not an experiment in which anyone changed their own day.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Looking at the day as one whole is still unusual. Nicholas Koemel, one of the co-authors, described the problem in a University of Sydney press release about another 2026 study by the same research group:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Sleep, physical activity and diet are all factors known to be linked to a healthier life, but these factors are usually studied separately from one another.<\/p>\n<cite>Nicholas Koemel, lead researcher at the Mackenzie Wearables Hub at the Charles Perkins Centre and co-author of the new study, The University of Sydney\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">6<\/a><\/sup><\/cite><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">The study followed 68,995 adults from the UK Biobank. Over an average of 8.0 years, 2,668 of them died.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup> The team then split the analysis by sleep: people who met the guidelines for sleep duration and people who slept short, and people with regular and people with irregular sleep.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Take an evening walk that comes out of a full night. In people who already met the guidelines for sleep duration, shifting 30 minutes from sleep to standing, to light activity or to moderate to vigorous activity went together with a slightly lower risk of dying from any cause during the follow-up period. The difference was largest for the vigorous form of activity.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup> In this group, half an hour less in bed in exchange for movement looked like a favourable trade.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now take the same half hour out of a night that was already short, and spend it on the sofa. In short sleepers, shifting 30 minutes from sleep to sitting, to standing or to light activity went together with a slightly higher risk of dying from a condition of the heart and blood vessels.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup> In people who slept enough, standing and light activity went together with a lower risk, but here with a higher one. The trade is the same; only the night the time came from is different.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A third pattern goes the other way. Shifting time from sitting to sleep went together with a more favourable picture, in both regular and irregular sleepers.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That standing comes out on the unfavourable side for short sleepers fits with earlier research by the same research group, in which more standing instead of sitting did not go together with better heart and blood vessel health.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">5<\/a><\/sup> Matthew Ahmadi, lead author of that earlier study and co-author of this one, summed it up in a 2024 press release from the University of Sydney:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">The key takeaway is that standing for too long does not make up for an otherwise sedentary lifestyle and, for some people, may be a risk to the health of their circulation.<\/p>\n<cite>Matthew Ahmadi, deputy director of the Mackenzie Wearables Research Hub at the Charles Perkins Centre and co-author of the new study, The University of Sydney\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">7<\/a><\/sup><\/cite><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">The authors draw a cautious conclusion: the links between shifts within the 24-hour day and the risk of dying may differ depending on how people sleep.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup> Put simply, the value of half an hour depends on where you take that time from. If you already sleep little, the night may be the wrong place to take that time from.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"wat-de-studie-niet-liet-zien\">What the study did not show<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">These are observational findings.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup> The study saw which shapes of the day went together with which outcomes. It did not show that changing your day changes your risk. The 30-minute swaps are calculated comparisons between people, not changes anyone actually made. Everyone in the study took part in the UK Biobank, so whether the pattern also holds for adults in the Netherlands has not been tested.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We have only read the article&#8217;s abstract, and several things are missing from it. The abstract does not say which sleep duration guideline was used or where the cut-off for short sleep lay. Nor does it say how regularity was measured, how long the wearable device was worn or how old the participants were. The abstract gives no result for the third group of causes of death the team examined: death from a group of conditions linked to physical activity. Nor does it give a result for short sleepers who shifted sleep time to vigorous activity. And nothing in the abstract shows that sleeping longer makes someone live longer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"wat-je-hiermee-kunt\">What you can do with this<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large bp-blog-partfig\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"630\" src=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/10\/bp-blog-bioritme-half-uur-slaap-s6-5912b4d2.webp\" alt=\"A person in their fifties walking through an outdoor market with a wicker basket full of fresh vegetables, laughing with a market trader.\" class=\"wp-image-10868\" srcset=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/10\/bp-blog-bioritme-half-uur-slaap-s6-5912b4d2.webp 1200w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/10\/bp-blog-bioritme-half-uur-slaap-s6-5912b4d2-300x158.webp 300w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/10\/bp-blog-bioritme-half-uur-slaap-s6-5912b4d2-1024x538.webp 1024w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/10\/bp-blog-bioritme-half-uur-slaap-s6-5912b4d2-768x403.webp 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Three directions follow from the study. None of them is a plan.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">First: look at your day as a whole before you add anything to it. A new habit always takes its time from somewhere, and the study suggests that what the habit pushes out matters as much as the habit itself.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Second: if your nights are already short, let the time for moving come from sitting rather than from sleep. In short sleepers, giving up sleep went together with the less favourable pattern, while shifting sitting time to sleep seemed favourable for both regular and irregular sleepers.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Third: if your rhythm has shifted, think about regularity alongside length. Earlier research in the same cohort found that a regular sleep-wake rhythm predicted the risk of dying better than the number of hours slept.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">3<\/a><\/sup> Restoring your biorhythm, in other words getting a shifted rhythm back into a steadier shape, is more about nights that resemble each other than about one long night at the weekend.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">None of this tells you what your own nights look like: whether you are a short sleeper, how regular your rhythm really is and where you are starting from. That is the open question, and the scan below is one way to make a start on the answer for yourself.<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-cta is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\">See what your nights look like<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The sleep scan asks questions about your nights and shows where you stand today, as a starting point. What the scan measures and what it is based on are set out on the scan page.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/bioprofile.com\/en\/sleep-test\/\">Start the sleep scan<\/a><\/div>\n\n<\/div>\n\n\n\n<p class=\"bp-blog-ctamicro wp-block-paragraph\">Free, about 3 minutes. An analysis of your answers, never a diagnosis. <a href=\"https:\/\/bioprofile.com\/en\/free-health-check-tests\/\">All health scans<\/a><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-sec--wash is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"veelgestelde-vragen\">Frequently asked questions<\/h2>\n\n\n\n<div class=\"wp-block-group bp-blog-faq-item is-layout-flow wp-block-group-is-layout-flow\">\n\n<h3 class=\"wp-block-heading\">What does biorhythm mean?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It is the pattern your 24 hours follow: when you sleep and wake up, and how your waking hours are split between sitting, standing and moving. In the study in this article, those five parts of the day were measured with a small wearable device and looked at together, because more of one always means less of another.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-faq-item is-layout-flow wp-block-group-is-layout-flow\">\n\n<h3 class=\"wp-block-heading\">Does the regularity of my body clock matter, or only the number of hours?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Regularity seems to matter. Among UK Biobank participants whose sleep was measured with a small wearable device, a regular sleep-wake rhythm went together with a lower risk of dying, and the rhythm predicted that risk better than the number of hours slept,\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">3<\/a><\/sup> while irregular patterns went together with a higher risk.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">4<\/a><\/sup> Both are observational findings.<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-faq-item is-layout-flow wp-block-group-is-layout-flow\">\n\n<h3 class=\"wp-block-heading\">Is it bad to sleep half an hour less so I can exercise?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In people who already slept enough, this study found the opposite: shifting half an hour from sleep to vigorous activity went together with a slightly lower risk of dying. For short sleepers, the summary reports a less favourable pattern when sleep time went to sitting, standing or light activity, and the summary gives no outcome for vigorous activity.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-faq-item is-layout-flow wp-block-group-is-layout-flow\">\n\n<h3 class=\"wp-block-heading\">Is standing better than sitting?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It is not clear. In earlier UK Biobank data collected with a small wearable device, standing more instead of sitting did not go together with better heart and blood vessel health.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">5<\/a><\/sup> In this study, among short sleepers, shifting sleep time to standing went together with a slightly higher risk of dying from a condition of the heart and blood vessels.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-faq-item is-layout-flow wp-block-group-is-layout-flow\">\n\n<h3 class=\"wp-block-heading\">When should I talk to my GP about my sleep?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Whenever you like. Thuisarts, the public website of the Nederlands Huisartsen Genootschap, puts it simply: make an appointment with your GP if you want to talk about your sleep problems.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">8<\/a><\/sup> A scan or an article can show you your patterns; what lies behind them is for a doctor to assess.<\/p>\n\n<\/div>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-sec--beige bp-blog-sec--tight is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"bronnen\">Sources<\/h2>\n\n\n\n<p class=\"bp-blog-srclead wp-block-paragraph\">Every source below was checked on the day this article was published. The numbering follows the text.<\/p>\n\n\n\n<ol class=\"wp-block-list bp-blog-refs\">\n\n<li>Bian W, Ahmadi MN, Mitchell JJ, Biswas RK, Koemel NA, Dumuid D, Chastin SFM, Blodgett JM, Chaput JP, Hamer M, Stamatakis E. Reallocation of 24-hour movement behaviour composition and mortality: exploring effect modification by sleep characteristics. American Journal of Epidemiology, 2026. <a href=\"https:\/\/doi.org\/10.1093\/aje\/kwag249\">doi.org\/10.1093\/aje\/kwag249<\/a><\/li>\n\n\n<li>Statistisches Bundesamt (Destatis). Paare mit Kindern im Haushalt schlafen im Schnitt 19 Minuten weniger pro Tag als Paare ohne Kinder im Haushalt. Zahl der Woche Nr. 25, 2024. <a href=\"https:\/\/www.destatis.de\/DE\/Presse\/Pressemitteilungen\/Zahl-der-Woche\/2024\/PD24_25_p002.html\">destatis.de<\/a><\/li>\n\n\n<li>Windred DP, Burns AC, Lane JM, Saxena R, Rutter MK, Cain SW, Phillips AJK. Sleep regularity is a stronger predictor of mortality risk than sleep duration: A prospective cohort study. Sleep, 2024. <a href=\"https:\/\/doi.org\/10.1093\/sleep\/zsad253\">doi.org\/10.1093\/sleep\/zsad253<\/a><\/li>\n\n\n<li>Cribb L, Sha R, Yiallourou S, Grima NA, Cavuoto M, Baril AA, Pase MP. Sleep regularity and mortality: a prospective analysis in the UK Biobank. eLife, 2023. <a href=\"https:\/\/doi.org\/10.7554\/eLife.88359\">doi.org\/10.7554\/eLife.88359<\/a><\/li>\n\n\n<li>Ahmadi MN, Coenen P, Straker L, Stamatakis E. Device-measured stationary behaviour and cardiovascular and orthostatic circulatory disease incidence. International Journal of Epidemiology, 2024. <a href=\"https:\/\/doi.org\/10.1093\/ije\/dyae136\">doi.org\/10.1093\/ije\/dyae136<\/a><\/li>\n\n\n<li>Nicholas Koemel, researcher at the Mackenzie Wearables Hub, Charles Perkins Centre, University of Sydney. Improving sleep, diet and increasing physical activity can increase lifespan. The University of Sydney, 2026. <a href=\"https:\/\/www.sydney.edu.au\/news-opinion\/news\/2026\/01\/14\/improving-sleep--diet-and-increasing-physical-activity-can-incre.html\">sydney.edu.au<\/a><\/li>\n\n\n<li>Matthew Ahmadi, lead author and deputy director of the Mackenzie Wearables Research Hub, University of Sydney. Standing more may not reduce cardiovascular disease risk, could increase circulatory disease. The University of Sydney, 2024. <a href=\"https:\/\/www.sydney.edu.au\/news-opinion\/news\/2024\/10\/17\/standing-more-may-not-reduce-cardiovascular-disease-risk--could-.html\">sydney.edu.au<\/a><\/li>\n\n\n<li>Thuisarts.nl (NHG). Ik slaap slecht. <a href=\"https:\/\/www.thuisarts.nl\/slaapproblemen\/ik-slaap-slecht\">thuisarts.nl<\/a><\/li>\n\n<\/ol>\n\n\n\n<p class=\"bp-blog-srcnote wp-block-paragraph\">Quotations from English have been translated by BioProfile.<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-sec--tight is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\">Also read<\/h2>\n\n\n\n<div class=\"wp-block-group bp-blog-related is-layout-flow wp-block-group-is-layout-flow\">\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/bioprofile.com\/en\/heart-rate-and-fitness-talking-therapy-heart-rhythm\/\">Heart rate and fitness: can talking therapy change your heart rhythm?<\/a><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/bioprofile.com\/en\/transcendental-meditation-at-work\/\">Transcendental Meditation at work: what six months among university staff showed<\/a><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/bioprofile.com\/en\/healthy-blood-pressure-american-heart-association-advisory\/\">Healthy blood pressure: why so few people reach it, and the new chart from the American Heart Association<\/a><\/p>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-sec bp-blog-sec--foot is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-blog-legal wp-block-paragraph\">BioProfile analyses your health status to guide you and your coach. It does not make a diagnosis, only a doctor can do that. Built on validated health questionnaires; the combined BioProfile score is not itself a validated clinical instrument yet. Your answers stay private (GDPR).<\/p>\n\n<\/div>\n\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>Biorhythm: sleeping, sitting, standing and moving share one day of 24 hours. A study of 68,995 adults suggests that half an hour carries a different weight for short sleepers.<\/p>\n","protected":false},"author":18,"featured_media":10864,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_meta-robots-noindex":"2","_yoast_wpseo_opengraph-image":"","_yoast_wpseo_opengraph-image-id":"","_yoast_wpseo_twitter-image":"","_yoast_wpseo_twitter-image-id":"","inline_featured_image":false,"footnotes":""},"categories":[114,67],"tags":[],"class_list":["post-10919","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-new-research","category-sleep-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Biorhythm: when half an hour of sleep counts | BioProfile<\/title>\n<meta name=\"description\" content=\"Biorhythm: sleeping, sitting, standing and moving share one day of 24 hours. 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