Why We Sleep: Difference between revisions
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== Introduction ==
{{Infobox book
| name = Why We Sleep
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| isbn = 978-1-5011-4431-8
| goodreads_rating = 4.37
| goodreads_rating_date =
| website = [https://www.simonandschuster.com/books/Why-We-Sleep/Matthew-Walker/
}}
'''''{{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 {{Tooltip|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=6 November 2025}}</ref><ref name="S&S9781501144318" /> It explains {{Tooltip|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=6 November 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://www.worldcat.org/oclc/1001968546 |website=WorldCat |publisher=OCLC |access-date=6 November 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 |date=21 August 2017 |access-date=6 November 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=6 November 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=6 November 2025}}</ref>
== Chapter summary ==
''This outline follows the {{Tooltip|Scribner}} hardcover first edition (3 October 2017; ISBN 978-1-5011-4431-8).''<ref name="S&S9781501144318">{{cite web |title=Why We Sleep |url=https://www.simonandschuster.com/books/Why-We-Sleep/Matthew-Walker/
=== I – This Thing Called Sleep ===
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🔭 '''16 – A New Vision for Sleep in the Twenty-First Century.''' The chapter lays out a layered roadmap—from bedrooms to boardrooms to national policy—aimed at shifting society from “sick care” to prevention by protecting sleep. At home and in transit, programmable LED spectra can time melatonin more intelligently, even brightening car cockpits with tempered blue light during dark winter commutes to cut drowsy driving. Phones and wearables could nudge earlier light in the mornings before high-stakes days, or automate jet-lag schedules by adjusting light, meals, and sleep opportunities. Workplaces can tune lighting across the day, match hours to chronotype, and normalize short naps; insurers and employers can reward verified seven-hour streaks—Aetna’s Mark Bertolini paid $25 per qualifying night, up to $500—because well-slept staff work faster, safer, and more creatively. Public health campaigns should finally treat drowsy driving like drunk driving, while emerging in-car analytics and personal sleep data point toward a “Breathalyzer” for fatigue and more enforceable laws. Schools that move start times later and hospitals that end marathon shifts show how institutions can rebuild schedules around the brain’s clock. None of these changes alone is enough, but together they add up to longer, healthier, and more productive lives. ''There is not going to be a single, magic-bullet solution.''
== Background & reception ==
🖋️ '''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, 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=6 November 2025}}</ref> The book aims to translate this body of evidence for general readers and to reframe insufficient sleep as a public-health problem.<ref name="UCB2017" /> Its four-part structure mirrors that goal.<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 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=6 November 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=6 November 2025 |last=Cookson |first=Clive}}</ref> ''{{Tooltip|Kirkus Reviews}}'' highlighted its accessible treatment of REM/NREM, memory, and health for a general audience.<ref name="Kirkus2017" /> ''{{Tooltip|Times Higher Education}}'' also praised its account of circadian disruption and modern habits.<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=6 November 2025}}</ref>
👎 '''Criticism'''. Zoë Heller in ''{{Tooltip|The New Yorker}}'' questioned some extrapolations and aspects of dream interpretation.<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=6 November 2025 |last=Heller |first=Zoë}}</ref> The ''Financial Times'' noted that some experts dispute claims about a broad decline in average sleep duration.<ref name="FT2017" /> In an academic review in ''{{Tooltip|Organization Studies}}'', {{Tooltip|Anu Valtonen}} critiqued the book’s neuroscientific framing.<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 |volume=40 |issue=5 |pages= |doi=10.1177/0170840619831946 |url=https://doi.org/10.1177/0170840619831946 |access-date=6 November 2025}}</ref> {{Tooltip|Columbia University}} statistician {{Tooltip|Andrew Gelman}} also collated criticisms of 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=6 November 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=6 November 2025}}</ref> He discussed practical {{Tooltip|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=6 November 2025}}</ref> In April 2019 his {{Tooltip|TED}} talk, “{{Tooltip|Sleep is your superpower}},” amplified the message globally, followed by {{Tooltip|TED}}’s ''{{Tooltip|Sleeping with Science}}'' series.<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=6 November 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=6 November 2025}}</ref>
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