{"id":6626,"date":"2026-08-27T08:00:00","date_gmt":"2026-08-27T08:00:00","guid":{"rendered":"https:\/\/bioprofile.com\/?p=6626"},"modified":"2026-10-01T18:38:10","modified_gmt":"2026-10-01T18:38:10","slug":"why-you-wake-up-tired","status":"publish","type":"post","link":"https:\/\/bioprofile.com\/en\/why-you-wake-up-tired\/","title":{"rendered":"Why you wake up tired: what a sleep test does and does not measure"},"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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Waarom dat gebeurt, wat een slaaptest over twee weken meet, wat hij niet kan zeggen en wat je met je score doet.\",\n      \"inLanguage\": \"nl-NL\",\n      \"author\": {\n        \"@type\": \"Person\",\n        \"name\": \"Jesse van der Velde\",\n        \"jobTitle\": \"Oprichter van BioProfile\",\n        \"url\": \"https:\/\/nl.linkedin.com\/in\/jessevdv\",\n        \"image\": \"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/07\/author-jesse-round-320.jpg\"\n      },\n      \"publisher\": {\n        \"@type\": \"Organization\",\n        \"name\": \"BioProfile\",\n        \"url\": \"https:\/\/bioprofile.com\/\",\n        \"logo\": {\n          \"@type\": \"ImageObject\",\n          \"url\": \"https:\/\/bioprofile.com\/wp-content\/uploads\/2024\/08\/logo.svg\"\n        }\n      },\n      \"datePublished\": \"2026-08-27\",\n      \"dateModified\": \"2026-08-27\",\n      \"articleSection\": \"Slaap en herstel\",\n      \"wordCount\": 1239,\n      \"about\": {\n        \"@type\": \"Thing\",\n        \"name\": \"Slaap en herstel\"\n      },\n      \"citation\": [\n        {\n          \"@type\": \"CreativeWork\",\n          \"name\": \"Harvey AG, Tang NKY. 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Maar het aantal uren zegt weinig over herstel: kort en lang slapen hangen allebei samen met een hogere sterfte. Kijk dus naar het patroon en pas daarna naar de klok.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Is een slaaptest hetzelfde als een slaaponderzoek?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Nee. Een slaaptest is een vragenlijst over hoe je de afgelopen twee weken sliep. Een slaaponderzoek meet met sensoren wat er in een nacht gebeurt: hersenactiviteit, ademhaling, beweging. Het eerste geeft je een beginwaarde die je zelf kunt herhalen; het tweede laat een arts zien wat er lichamelijk in je slaap gebeurt.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Kan een slaaptest slapeloosheid vaststellen?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Nee. 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Usually that is not about the number of hours, but about what happens within those hours and about how little of it you take in yourself. How long you take to fall asleep, how often you wake up, how rested you get up and what the night costs you during the day: that is what decides whether you recover, and that is exactly what you remember badly. A sleep test measures how much these complaints trouble you, and gives you an indication of where you stand today in this area, the first of the 11 health areas the full scan assesses. This is not a diagnosis. It is insight, to see where you stand today. And to help you make better choices in your food and your lifestyle. What this scan does not do: measure a night, point to a cause or make a diagnosis. Only a doctor can do that last one.<\/p>\n\n\n\n<div class=\"wp-block-group bp-blog-verify bp-blog-verify--top is-layout-flow wp-block-group-is-layout-flow\">\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"320\" height=\"320\" src=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/09\/bp-verifier-sonia-s-ba5acddf.jpg\" alt=\"Portrait of Sonia Sanz Mu\u00f1oz\" class=\"wp-image-5760\" srcset=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/09\/bp-verifier-sonia-s-ba5acddf.jpg 320w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/09\/bp-verifier-sonia-s-ba5acddf-300x300.jpg 300w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/09\/bp-verifier-sonia-s-ba5acddf-150x150.jpg 150w\" sizes=\"(max-width: 320px) 100vw, 320px\" \/><\/figure>\n\n\n\n<p class=\"bp-blog-verify-name wp-block-paragraph\">Verified by Sonia Sanz Mu\u00f1oz, PhD<\/p>\n\n\n\n<p class=\"bp-blog-verify-cred wp-block-paragraph\">PhD from the University of Wollongong<\/p>\n\n\n\n<p class=\"bp-blog-verify-date wp-block-paragraph\">Checked on 25 September 2026<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-takeaways is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\">In short<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>Waking up tired is rarely about the number of hours. It is about falling asleep, staying asleep, getting up rested and what the night costs you during the day.<\/li>\n\n\n<li>How a night feels to you is a poor yardstick: people with sleep complaints overestimate how long they lie awake and underestimate how much they sleep.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup><\/li>\n\n\n<li>A sleep test measures a pattern over two weeks and gives you a starting value. It does not measure one night, does not point out a cause and does not give 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=\"#genoeg-uren-en-toch-moe-wat-er-aan-de-hand-kan-zijn\">Enough hours, and still tired: what may be going on<\/a><\/li>\n\n\n<li><a href=\"#waarom-je-gevoel-over-je-nacht-een-slechte-meetlat-is\">Why your feeling about your night is a poor yardstick<\/a><\/li>\n\n\n<li><a href=\"#wat-een-slaaptest-meet\">What a sleep test measures<\/a><\/li>\n\n\n<li><a href=\"#wat-een-slaaptest-niet-meet\">What a sleep test does not measure<\/a><\/li>\n\n\n<li><a href=\"#wat-je-met-je-score-doet\">What you do with your score<\/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=\"genoeg-uren-en-toch-moe-wat-er-aan-de-hand-kan-zijn\">Enough hours, and still tired: what may be going on<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In the Netherlands, sleeping badly is the rule rather than the exception. In a nationally representative sample of 2,089 Dutch people between 18 and 70, more than three in ten reported a general sleep disturbance and more than four in ten reported too little sleep.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">2<\/a><\/sup> Most of those people are not lying awake all night. They sleep, just not well enough to get up rested.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The hard part is that you do not really feel a shortfall like that. In a laboratory study, 48 healthy adults slept four, six or eight hours for fourteen nights in a row. At four and six hours the losses in performance piled up further every day, while after the first few days the participants hardly rated themselves as sleepier.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">3<\/a><\/sup> You get used to the feeling, while the shortfall stays.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">More hours is not automatically the answer here. In a summary of sixteen population studies, both short and long sleep were linked to higher mortality: short sleep with 12 percent more, long sleep with 30 percent more.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">4<\/a><\/sup> That is a link, not a cause, but it does say that &#8220;longer&#8221; is a poor measure. Recovery is the measure.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"waarom-je-gevoel-over-je-nacht-een-slechte-meetlat-is\">Why how your night feels is a poor yardstick<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">With sleep, you are not there yourself. You know exactly how you feel during the day; what happened at night is something you have to reconstruct afterwards. Research into the perception of sleep shows that people with sleep complaints systematically overestimate how long they lie awake and underestimate how much they really sleep, compared with objective measurements.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">1<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That is why no serious sleep instrument asks about one night. The Pittsburgh Sleep Quality Index, built in 1989 for research and the clinic, looks at a month and at seven components, from how long you take to fall asleep to how you function during the day.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">5<\/a><\/sup> A pattern over weeks, split into the components that matter: that is what you need in order to know whether things are getting better or worse.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"wat-een-slaaptest-meet\">What a sleep test measures<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A sleep test such as <a href=\"https:\/\/bioprofile.com\/en\/sleep-test\/\">the BioProfile sleep scan<\/a> asks five questions about the past two weeks: how long you take to fall asleep, how often you wake up at night, how often you get up rested, how satisfied you are with your sleep, and how much poor sleep hinders you during the day. Each question is given points, the points are added up and converted into a sleep score from 0 to 100, with the reading band it falls into. Higher is better.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The questions are modelled on the Insomnia Severity Index, a scale of seven questions about the same two weeks. That scale was tested in 959 people from the general population and 183 people in treatment, with an internal consistency of 0.90 and 0.91,\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">6<\/a><\/sup> and it moves in step with sleep diaries and with sleep studies.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">7<\/a><\/sup> Our five questions follow the construct and the look-back period of that scale, in our own words. They are not a copy of it, so the score is not a validated clinical score. What you get is a structured picture of your sleep burden, and a starting value you can measure again two weeks later.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"wat-een-slaaptest-niet-meet\">What a sleep test does not measure<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A questionnaire reads the sleep burden you describe. The cause of it stays out of view. It cannot tell you whether something is physically disturbing your sleep, such as your breathing, pain or hormonal changes, and it is not a sleep study.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A sleep test does not give a diagnosis either. The European guideline for insomnia puts questionnaires and sleep diaries at the front of the assessment by a doctor, alongside the conversation itself; a sleep study in the laboratory is there to detect other sleep problems if there is reason for it, such as pauses in your breathing during sleep.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">8<\/a><\/sup> So a questionnaire is a good first sieve, and a first sieve is something other than a result. A low score means that looking further makes sense, and nothing more. Loud snoring with pauses in breathing, or falling asleep unintentionally during the day, are reasons to go to a doctor and not reasons to work on a score.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"wat-je-met-je-score-doet\">What you do with your score<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Most people start with the solution: to bed earlier, the phone away after ten, a new mattress. All sensible, and three weeks later you still do not know whether it did anything, because you never recorded where you began. A score taken today is that starting value. Repeat the test two weeks later, on the same questions, and you no longer have a feeling about your nights but two numbers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you want to change something in those two weeks, choose something whose effect has been measured. Coffee is one: 400 milligrams of caffeine, taken six hours before bedtime, still disturbed sleep measurably compared with placebo.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">9<\/a><\/sup> Screen light is a second: people who read on a light-emitting screen in the hours before bed instead of from a paper book took longer to fall asleep, produced less melatonin and were less alert the next morning.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">10<\/a><\/sup><\/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\">Measure where you start<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Five questions about the past two weeks, about three minutes, and your sleep score is in your dashboard. What the sleep test measures and what it is based on is 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\/\">Take the sleep test<\/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\">How many hours of sleep do I need?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In 2015 the American sleep associations reached a consensus of seven hours or more a night for adults.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">11<\/a><\/sup> But the number of hours says little about recovery: short sleep and long sleep are both linked to higher mortality.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">4<\/a><\/sup> So look at the pattern, and only after that at the clock.<\/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 a sleep test the same as a sleep study?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. A sleep test is a questionnaire about how you slept over the past two weeks. A sleep study uses sensors to measure what happens during a night: brain activity, breathing, movement. The first gives you a starting value that you can repeat yourself; the second shows a doctor what happens physically in your sleep.<\/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\">Can a sleep test establish insomnia?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. A sleep test reads how much your sleep is weighing on you and does not make a diagnosis. Only a doctor can do that, based on a conversation, a sleep diary and, if it is needed, further investigation.\u2060<sup class=\"bp-blog-sup\"><a href=\"#bronnen\">8<\/a><\/sup> A low score is a reason to look further and is not a result in itself.<\/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\">How often do I take the sleep test again?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Every two weeks, because the questions cover two weeks. Any sooner and you measure the same nights twice; any later and your memory starts to have a say again. Two measurements over the same questions show whether things are getting better, getting worse or staying the same.<\/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>Harvey AG, Tang NKY. (Mis)perception of sleep in insomnia: a puzzle and a resolution. Psychological Bulletin, 2012. <a href=\"https:\/\/doi.org\/10.1037\/a0025730\">doi.org\/10.1037\/a0025730<\/a><\/li>\n\n\n<li>Kerkhof GA. Epidemiology of sleep and sleep disorders in The Netherlands. Sleep Medicine, 2017. <a href=\"https:\/\/doi.org\/10.1016\/j.sleep.2016.09.015\">doi.org\/10.1016\/j.sleep.2016.09.015<\/a><\/li>\n\n\n<li>Van Dongen HPA, Maislin G, Mullington JM, Dinges DF. The cumulative cost of additional wakefulness: dose-response effects on neurobehavioral functions and sleep physiology from chronic sleep restriction and total sleep deprivation. Sleep, 2003. <a href=\"https:\/\/doi.org\/10.1093\/sleep\/26.2.117\">doi.org\/10.1093\/sleep\/26.2.117<\/a><\/li>\n\n\n<li>Cappuccio FP, D&#8217;Elia L, Strazzullo P, Miller MA. Sleep duration and all-cause mortality: a systematic review and meta-analysis of prospective studies. Sleep, 2010. <a href=\"https:\/\/doi.org\/10.1093\/sleep\/33.5.585\">doi.org\/10.1093\/sleep\/33.5.585<\/a><\/li>\n\n\n<li>Buysse DJ, Reynolds CF, Monk TH, Berman SR, Kupfer DJ. The Pittsburgh Sleep Quality Index: a new instrument for psychiatric practice and research. Psychiatry Research, 1989. <a href=\"https:\/\/doi.org\/10.1016\/0165-1781(89)90047-4\">doi.org\/10.1016\/0165-1781(89)90047-4<\/a><\/li>\n\n\n<li>Morin CM, Belleville G, B\u00e9langer L, Ivers H. The Insomnia Severity Index: psychometric indicators to detect insomnia cases and evaluate treatment response. Sleep, 2011. <a href=\"https:\/\/doi.org\/10.1093\/sleep\/34.5.601\">doi.org\/10.1093\/sleep\/34.5.601<\/a><\/li>\n\n\n<li>Bastien CH, Valli\u00e8res A, Morin CM. Validation of the Insomnia Severity Index as an outcome measure for insomnia research. Sleep Medicine, 2001. <a href=\"https:\/\/doi.org\/10.1016\/S1389-9457(00)00065-4\">doi.org\/10.1016\/S1389-9457(00)00065-4<\/a><\/li>\n\n\n<li>Riemann D, Espie CA, Altena E, et al. The European Insomnia Guideline: an update on the diagnosis and treatment of insomnia 2023. Journal of Sleep Research, 2023. <a href=\"https:\/\/doi.org\/10.1111\/jsr.14035\">doi.org\/10.1111\/jsr.14035<\/a><\/li>\n\n\n<li>Drake C, Roehrs T, Shambroom J, Roth T. Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed. Journal of Clinical Sleep Medicine, 2013. <a href=\"https:\/\/doi.org\/10.5664\/jcsm.3170\">doi.org\/10.5664\/jcsm.3170<\/a><\/li>\n\n\n<li>Chang AM, Aeschbach D, Duffy JF, Czeisler CA. Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness. Proceedings of the National Academy of Sciences, 2015. <a href=\"https:\/\/doi.org\/10.1073\/pnas.1418490112\">doi.org\/10.1073\/pnas.1418490112<\/a><\/li>\n\n\n<li>Watson NF, Badr MS, Belenky G, et al. Recommended amount of sleep for a healthy adult: a joint consensus statement of the American Academy of Sleep Medicine and Sleep Research Society. Sleep, 2015. <a href=\"https:\/\/doi.org\/10.5665\/sleep.4716\">doi.org\/10.5665\/sleep.4716<\/a><\/li>\n\n<\/ol>\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\">Written by<\/h2>\n\n\n\n<div class=\"wp-block-group bp-blog-author is-layout-flow wp-block-group-is-layout-flow\">\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"320\" height=\"320\" src=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/07\/author-jesse-round-320.jpg\" alt=\"Jesse van der Velde\" class=\"wp-image-4815\" srcset=\"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/07\/author-jesse-round-320.jpg 320w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/07\/author-jesse-round-320-300x300.jpg 300w, https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/07\/author-jesse-round-320-150x150.jpg 150w\" sizes=\"(max-width: 320px) 100vw, 320px\" \/><\/figure>\n\n\n\n<div class=\"wp-block-group bp-blog-authorid is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-blog-authorrole wp-block-paragraph\">Founder of BioProfile<\/p>\n\n\n\n<p class=\"bp-blog-authorname wp-block-paragraph\">Jesse van der Velde<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-authorbody is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-blog-authorbio wp-block-paragraph\">Since 2006 they have guided people towards a new body and optimal health, and have written or co-written fifteen books on nutrition and health. Forever Young (2012) and Superfood Recipes (2013) both reached number 1 in the Netherlands.<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-blog-authormeta is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-blog-authorbio wp-block-paragraph\"><a href=\"https:\/\/nl.linkedin.com\/in\/jessevdv\">LinkedIn<\/a><\/p>\n\n\n\n<p class=\"bp-blog-dates wp-block-paragraph\">Published on 27 August 2026 \u00b7 Last updated on 27 August 2026<\/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>You put in the hours and still wake up tired. Why that happens, what a sleep test measures over two weeks, what it cannot tell you and what you do with your score.<\/p>\n","protected":false},"author":18,"featured_media":6178,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_meta-robots-noindex":"2","_yoast_wpseo_opengraph-image":"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/09\/bp-blog-waarom-je-moe-wakker-wordt-232e1009.webp","_yoast_wpseo_opengraph-image-id":"","_yoast_wpseo_twitter-image":"https:\/\/bioprofile.com\/wp-content\/uploads\/2026\/09\/bp-blog-waarom-je-moe-wakker-wordt-232e1009.webp","_yoast_wpseo_twitter-image-id":"","inline_featured_image":false,"footnotes":""},"categories":[67],"tags":[],"class_list":["post-6626","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","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>Why you wake up tired: what a sleep test measures | BioProfile<\/title>\n<meta name=\"description\" content=\"You put in the hours and still wake up tired. 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