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“A thoughtful tour through the still dimly understood state of being asleep … Why We Sleep is a book on a mission. Walker is in love with sleep and wants us to fall in love with sleep, too. And it is urgent. He makes the argument, persuasively, that we are in the midst of a ‘silent sleep loss epidemic’ that poses ‘the greatest public health challenge we face in the 21st century’ … Why We Sleep mounts a persuasive, exuberant case for addressing our societal sleep deficit and for the virtues of sleep itself. It is recommended for night-table reading in the most pragmatic sense.”
-New York Times Book Review

"The director of UC Berkeley's Sleep and Neuroimaging Lab explores the purpose of slumber. Understanding the 'why,' it turns out, just might help you with the 'how to.'"
-People

"A neuroscientist has found a revolutionary way of being cleverer, more attractive, slimmer, happier, healthier and of warding off cancer - a good night’s shut-eye ... It’s probably a little too soon to tell you that Why We Sleep saved my life, but I can tell you that it’s been an eye-opener."
-The Guardian

"This is a stimulating and important book which you should read in the knowledge that the author is, as he puts it, 'in love with everything that sleep is and does.' But please do not begin it just before bedtime."
-Financial Times

Chapter Page

Part 1 This Thing Called Sleep
Chapter 1 To Sleep … 3
Chapter 2 Caffeine, Jet Lag, and Melatonin: Losing and Gaining Control of Your Sleep Rhythm 13
Chapter 3 Defining and Generating Sleep: Time Dilation and What We Learned from a Baby in 1952 38
Chapter 4 Ape Beds, Dinosaurs, and Napping with Half a Brain Who Sleeps, How Do We Sleep, and How Much? 56
Chapter 5 Changes in Sleep Across the Life Span 78

Part 2 Why Should You Sleep?
Chapter 6 Your Mother and Shakespeare Knew: The Benefits of Sleep for the Brain 107
Chapter 7 Too Extreme for the Guinness Book of World Records: Sleep Deprivation and the Brain 133
Chapter 8 Cancer, Heart Attacks, and a Shorter Life: Sleep Deprivation and the Body 164

Part 3 How and Why We Dream
Chapter 9 Routinely Psychotic: REM-Sleep Dreaming 193
Chapter 10 Dreaming as Overnight Therapy 206
Chapter 11 Dream Creativity and Dream Control 219

Part 4 From Sleeping Pills to Society Transformed
Chapter 12 Things That Go Bump in the Night: Sleep Disorders and Death Caused by No Sleep 237
Chapter 13 iPads, Factory Whistles, and Nightcaps: What's Stopping You from Sleeping? 265
Chapter 14 Hurting and Helping Your Sleep: Pills vs. Therapy 282
Chapter 15 Sleep and Society: What Medicine and Education Are Doing Wrong; What Google and NASA Are Doing Right 296
Chapter 16 A New Vision for Sleep in the Twenty-First Century 324

Conclusion: To Sleep or Not to Sleep 340
Appendix: Twelve Tips for Healthy Sleep 341
Illustration Permissions 343
Acknowledgments 344

A New York Times bestseller and international sensation, this “stimulating and important book” (Financial Times) from the director of UC Berkeley’s Center for Human Sleep Science is a fascinating dive into the purpose and power of slumber. As the Guardian said, Walker explains “how a good night's shut-eye can make us cleverer, more attractive, slimmer, happier, healthier, and ward off cancer.”

With two appearances on CBS This Morning and Fresh Air's most popular interview of 2017, Matthew Walker has made abundantly clear that sleep is one of the most important but least understood aspects of our life. Until very recently, science had no answer to the question of why we sleep, or what good it served, or why we suffer such devastating health consequences when it is absent. Compared to the other basic drives in life-eating, drinking, and reproducing-the purpose of sleep remains more elusive.

Within the brain, sleep enriches a diversity of functions, including our ability to learn, memorize, and make logical decisions. It recalibrates our emotions, restocks our immune system, fine-tunes our metabolism, and regulates our appetite. Dreaming creates a virtual reality space in which the brain melds past and present knowledge, inspiring creativity.

In this “compelling and utterly convincing” (The Sunday Times) book, preeminent neuroscientist and sleep expert Matthew Walker provides a revolutionary exploration of sleep, examining how it affects every aspect of our physical and mental well-being. Charting the most cutting-edge scientific breakthroughs, and marshalling his decades of research and clinical practice, Walker explains how we can harness sleep to improve learning, mood and energy levels, regulate hormones, prevent cancer, Alzheimer’s and diabetes, slow the effects of aging, and increase longevity. He also provides actionable steps towards getting a better night’s sleep every night.

Clear-eyed, fascinating, and accessible, Why We Sleep is a crucial and illuminating book. Written with the precision of Atul Gawande, Andrew Solomon, and Sherwin Nuland, it is “recommended for night-table reading in the most pragmatic sense” (The New York Times Book Review).