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{{Tooltip|'''''{{Tooltip|Why We Sleep}}'''''}} is a popular-science book about the neuroscience and physiology of sleep, first published in the {{Tooltip|United States}} by {{Tooltip|Scribner}} on 3 October 2017 (368 pages; ISBN 978-1-5011-4431-8).<ref name="S&S9781501144318" /><ref name="OCLC975365716" /> Written by neuroscientist {{Tooltip|Matthew P. Walker}}, a professor at the {{Tooltip|University of California, Berkeley}}, the book synthesizes laboratory, clinical, and epidemiological findings on how sleep and circadian biology shape learning, memory, emotion, immunity, metabolism, and long-term health.<ref name="UCBProfile">{{cite web |title=Matthew P. Walker |url=https://psychology.berkeley.edu/people/matthew-p-walker |website=UC Berkeley Department of Psychology |publisher=University of California, Berkeley |access-date=19 October 2025}}</ref><ref name="S&S9781501144318" /> It explains NREM/{{Tooltip|REM sleep}} and {{Tooltip|circadian rhythms}}, describes the consequences of insufficient sleep, and discusses practical topics such as caffeine, {{Tooltip|jet lag}}, {{Tooltip|melatonin}}, {{Tooltip|sleep disorders}}, and when behavioral therapy is preferable to sleeping pills.<ref name="S&S9781501144318" /><ref name="UCB2017">{{cite web |title=Everything you need to know about sleep, but are too tired to ask |url=https://news.berkeley.edu/2017/10/17/whywesleep/ |website=UC Berkeley News |publisher=University of California, Berkeley |date=17 October 2017 |access-date=19 October 2025 |last=Anwar |first=Yasmin}}</ref> The book is arranged in four parts—on what sleep is, why it matters, how and why we dream, and how society might change—presented in clear prose for general readers.<ref name="OCLC1001968546">{{cite web |title=Why we sleep : unlocking the power of sleep and dreams (table of contents) |url=https://search.worldcat.org/ja/title/why-we-sleep-unlocking-the-power-of-sleep-and-dreams/oclc/1001968546 |website=WorldCat |publisher=OCLC |access-date=19 October 2025}}</ref><ref name="Kirkus2017">{{cite web |title=Why We Sleep |url=https://www.kirkusreviews.com/book-reviews/matthew-walker/why-we-sleep/ |website=Kirkus Reviews |access-date=19 October 2025}}</ref> According to the publisher, it is a {{Tooltip|New York Times}} bestseller and an international sensation; it was named one of {{Tooltip|Publishers Weekly}}’s Best Books of 2017, and {{Tooltip|The Sunday Times}}’ year-end list recorded 162,125 {{Tooltip|UK}} copies sold in 2018.<ref name="S&S9781501144318" /><ref name="PWBest2017">{{cite web |title=Best Books 2017 |url=https://best-books.publishersweekly.com/pw/best-books/2017 |website=Publishers Weekly |access-date=19 October 2025}}</ref><ref name="STimes2018">{{cite news |title=Books: The Sunday Times Bestsellers of the Year, 2018 |url=https://www.thetimes.com/culture/books/article/books-the-sunday-times-bestsellers-of-the-year-2018-k9wn67tw6 |work=The Sunday Times |date=30 December 2018 |access-date=19 October 2025}}</ref>
== Chapter summary ==
🖋️ '''Author & writing'''. {{Tooltip|Matthew P. Walker}} is Professor of Neuroscience and Psychology at the {{Tooltip|University of California, Berkeley}}, and founder/director of the {{Tooltip|Center for Human Sleep Science}}; his academic work focuses on sleep’s role in memory, emotion, and health.<ref name="UCBProfile" /> His laboratory studies use {{Tooltip|EEG}} and {{Tooltip|MRI}} among other methods to examine how sleep loss affects cognition and physiology, an approach that underpins the book’s explanations and case studies.<ref name="WalkerLab">{{cite web |title=Sleep and Neuroimaging Lab — Research focus |url=https://walkerlab.berkeley.edu/science.html |website=Center for Human Sleep Science, UC Berkeley |publisher=University of California, Berkeley |access-date=19 October 2025}}</ref> The book aims to translate this body of evidence for general readers and to reframe insufficient sleep as a major public-health problem.<ref name="UCB2017" /> Its four-part structure (sleep mechanisms; why sleep matters; dreaming; and society) mirrors that goal of combining physiology with practical guidance.<ref name="OCLC1001968546" /><ref name="S&S9781501144318" />
📈 '''Commercial reception'''. The publisher reports that ''{{Tooltip|''Why We Sleep''}}'' is a {{Tooltip|New York Times}} bestseller and an international sensation.<ref name="S&S9781501144318" /> In the {{Tooltip|UK}}, ''{{Tooltip|''The Sunday Times''}}'' listed it among the year’s bestsellers in 2018 with 162,125 copies sold.<ref name="STimes2018" /> In the trade press, it was selected as one of ''{{Tooltip|''Publishers Weekly''}}''’s Best Books of 2017.<ref name="PWBest2017" />
👍 '''Praise'''. {{Tooltip|Mark O’Connell}} in ''{{Tooltip|''The Guardian''}}'' welcomed the book’s urgent message about sleep’s centrality to health and education and described it as “an eye-opener.”<ref name="Guardian2017">{{cite news |title=Why We Sleep by Matthew Walker review – how more sleep can save your life |url=https://www.theguardian.com/books/2017/sep/21/why-we-sleep-by-matthew-walker-review |work=The Guardian |date=21 September 2017 |access-date=19 October 2025 |last=O'Connell |first=Mark}}</ref> {{Tooltip|Clive Cookson}} in the ''{{Tooltip|''Financial Times''}}'' called it “stimulating and important,” summarising evidence linking sleep to cognition and disease.<ref name="FT2017">{{cite news |title=Why We Sleep by Matthew Walker — for a longer life, press snooze |url=https://www.ft.com/content/e9dc72b2-a535-11e7-9e4f-7f5e6a7c98a2 |work=Financial Times |date=3 October 2017 |access-date=19 October 2025 |last=Cookson |first=Clive}}</ref> ''{{Tooltip|''Kirkus Reviews''}}'' highlighted its accessible treatment of REM/NREM, memory, and the health benefits of sleep for a general audience.<ref name="Kirkus2017" /> ''{{Tooltip|''Times Higher Education''}}'' also praised its account of how circadian disruption and modern habits damage health, noting the book’s timely urgency.<ref>{{cite news |title=Review: Why We Sleep, by Matthew Walker |url=https://www.timeshighereducation.com/books/review-why-we-sleep-matthew-walker-allen-lane |work=Times Higher Education |date=5 October 2017 |access-date=19 October 2025}}</ref>
👎 '''Criticism'''. Zoë Heller in ''{{Tooltip|''The New Yorker''}}'' questioned some extrapolations and aspects of dream interpretation, arguing that parts of the book overreach what current methods can verify.<ref name="NewYorker2018">{{cite news |title=Why We Sleep, and Why We Often Can’t |url=https://www.newyorker.com/magazine/2018/12/10/why-we-sleep-and-why-we-often-cant |work=The New Yorker |date=10 December 2018 |access-date=19 October 2025 |last=Heller |first=Zoë}}</ref> The ''Financial Times'' review noted that some experts dispute claims about a broad decline in average sleep duration, signalling disagreement within the field.<ref name="FT2017" /> In an academic review in ''{{Tooltip|''Organization Studies''}}'', {{Tooltip|Anu Valtonen}} critiqued the book’s neuroscientific framing and raised concerns about speculative leaps and neglected social contexts of sleep.<ref>{{cite journal |last=Valtonen |first=Anu |date=20 February 2019 |title=The new science of sleep and dreams (Book review: Why We Sleep) |journal=Organization Studies |doi=10.1177/0170840619831946 |url=https://journals.sagepub.com/doi/10.1177/0170840619831946 |access-date=19 October 2025}}</ref> {{Tooltip|Columbia University}} statistician {{Tooltip|Andrew Gelman}} also discussed alleged factual and statistical problems raised by critics, urging caution about headline claims.<ref name="Gelman2019">{{cite web |title=Is Matthew Walker’s “Why We Sleep” Riddled with Scientific and Factual Errors? |url=https://statmodeling.stat.columbia.edu/2019/11/18/is-matthew-walkers-why-we-sleep-riddled-with-scientific-and-factual-errors/ |website=Statistical Modeling, Causal Inference, and Social Science |publisher=Columbia University |date=18 November 2019 |access-date=19 October 2025 |last=Gelman |first=Andrew}}</ref>
🌍 '''Impact & adoption'''. Walker promoted the book’s themes in mainstream media, including an interview on {{Tooltip|NPR}}’s ''{{Tooltip|''Fresh Air''}}'' on 16 October 2017.<ref>{{cite web |title=Sleep Scientist Warns Against Walking Through Life ‘In An Underslept State’ |url=https://www.freshair.com/topics/health-medicine/sleep |website=Fresh Air Archive |publisher=WHYY/NPR |date=16 October 2017 |access-date=19 October 2025}}</ref> He discussed practical sleep hygiene on ''{{Tooltip|''CBS This Morning''}}'' the same week.<ref>{{cite news |title=The health costs of losing sleep and tips for getting a good night’s rest |url=https://www.cbsnews.com/news/lack-of-sleep-health-effects-and-tips-for-good-nights-rest/ |work=CBS News |date=11 October 2017 |access-date=19 October 2025}}</ref> In April 2019 his {{Tooltip|TED}} talk, “{{Tooltip|Sleep is your superpower}},” further amplified the message to a global audience, followed by {{Tooltip|TED}}’s ''Sleeping with Science'' series that extended the book’s ideas for the public.<ref name="TED2019">{{cite web |title=Matt Walker: Sleep is your superpower |url=https://www.ted.com/talks/matt_walker_sleep_is_your_superpower |website=TED.com |date=2019 |access-date=19 October 2025}}</ref><ref name="TEDSeries2020">{{cite web |title=Sleeping with Science |url=https://www.ted.com/series/sleeping_with_science |website=TED.com |access-date=19 October 2025}}</ref>
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