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Why We Sleep: Unlocking the Power of Sleep and Dreams

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“Why We Sleep is an important and fascinating book…Walker taught me a lot about this basic activity that every person on Earth needs. I suspect his book will do the same for you.” —Bill Gates A New York Times bestseller and international sensation, this “stimulating and important book” (Financial Times) is a fascinating dive into the purpose and power of slumber. 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). Read more

Publisher ‏ : ‎ Scribner; Reprint edition (June 19, 2018)


Language ‏ : ‎ English


Paperback ‏ : ‎ 368 pages


ISBN-10 ‏ : ‎ 1501144324


ISBN-13 ‏ : ‎ 25


Item Weight ‏ : ‎ 2.31 pounds


Dimensions ‏ : ‎ 5.5 x 0.92 x 8.38 inches


Best Sellers Rank: #1,051 in Books (See Top 100 in Books) #1 in Neuroscience (Books) #2 in Sleep Disorders #6 in Anatomy (Books)


#1 in Neuroscience (Books):


#2 in Sleep Disorders:


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Top Amazon Reviews

    • A Wake-Up Call for Better Sleep
"I was once fond of saying, 'Sleep is the third pillar of good health, alongside diet and exercise.' I have changed my tune. Sleep is more than a pillar; it is the foundation on which the other two health bastions sit. Take away the bedrock of sleep, or weaken it just a little, and careful eating or physical exercise become less than effective, as we shall see." ― from “Why We Sleep: Unlocking the Power of Sleep and Dreams” Matthew Walker's "Why We Sleep" is one of the two most important books I have read in my life1. Having done a little stock trading along with having survived several tech industry "death marches," things which are quite antithetical to good sleep, I had little idea just how destructive to your health lack of sleep is. A few years back, however, I began to hear that lack of sleep was correlated with diseases such as Alzheimer's, but this did not strike me as convincing since correlation is not causation. Indeed, a little later, I heard about this book at work but was somewhat ambivalent. It's just going to tell me that doctors think sleep is essential but are vague as to why were my thoughts. Luckily I noticed an episode of Sam Harris's podcast "Making Sense" in which he interviewed Walker. Since Sam Harris is a figure whose judgment I highly respect, and I know he is very discerning about whom he invites on as guests, I decided there was probably more of value to say about sleep than I initially thought. Correlation and Causation Walker's book makes a compelling case that sleep is the bedrock of good health. He convincingly demonstrates that lack of good sleep can lead to downward spirals in health with the development of health conditions that make it hard to sleep, leading to more serious health conditions due to lack of sleep, making it even harder to sleep… and so on into a vicious cycle. Walker is careful to lay out in detail when the causal mechanisms are well understood, as in the case of Alzheimer's and cancer, and when lack of sleep is currently a suspect, although the exact causal mechanism has yet to be established. By the end of the book, I realized, however, that sleep is so foundational that even a mere correlation to some bad health condition is enough to make lack of good sleep a prime suspect worth considering as a cause. Organization and Style According to Walker, "Why We Sleep" is organized so that later chapters can be read without a strict need to read earlier ones first. Thus, if you use sleeping pills and want to know why you should not, he says it is okay to and, indeed, encourages you to jump to that section right away. That being said, I found the writing style so engaging (with a few minor instances of excessive detail) and the content so important that I read it straight through. Having read it this way, my sense was that the book frontloads its most important content: It explains in detail, with specifics such as the chemicals involved, why you feel more tired at certain parts of the day than others. To give you the motivation to get good sleep, the deleterious effects of lack of sleep also come near the beginning of the book. The Enormous and Far-Ranging Effects of Poor Sleep The effects of lack of sleep go beyond just affecting your physical health, however, and Walker shows just how destructive lack of sleep will be on your ability to learn new things. One of the most remarkable findings is that you need to get good sleep after learning new information. You cannot even get a single night of suboptimal sleep the first night, or some information will be lost permanently. Conversely, if you get that first night of good sleep after learning something new, sleep on subsequent nights will continue to solidify what you have learned: all while you sleep! This is just one case where Walker details how, unfortunately, missed sleep cannot be well compensated for by more sleep later: Permanent losses are involved. Dreams Some of the most fascinating information in the book is on the role of dreams. Here we learn of their therapeutic qualities, including some of the underlying biochemistry involved. Discoveries here have led to a better understanding of PTSD, including better treatment methods. Walker also describes how dreams foster creativity by establishing connections between distantly related pieces of information stored in the brain. Here Walker includes a particularly fascinating anecdote of how Edison enhanced his creativity by waking himself from naps and immediately recording his thoughts. Empathy For Different Circadian Rhythms Throughout the book, Walker emphasizes how what we have learned about sleep has implications for how we should view people who may not have what seem like "normal" sleep patterns more empathetically. In particular, he emphasizes that teenagers want to get up and go to bed later, not due to laziness but because they run on a different circadian rhythm. It is something that is biologically hardwired into them. A consequence is that forcing school start times incompatible with this has devastating effects on how well they learn compared to well they could. Similar facts are true of people who are naturally "night owls" and run on different circadian rhythms than the rest of us. Minor Flaws Walker's book has only a few minor flaws: 1. Although he provides an excellent explanation of why most sleeping pills should be avoided, he does not mention whether this includes melatonin. 2. His discussion of the nationwide dollar impacts of poor sleep could be better presented. The unfortunate truth is that given the numbers we have heard spent on wars and, especially, financial bailouts and stimulus, rattling off numbers that are “merely” in the hundreds of millions or even low billions hits us in a place we are now numb. 3. Although Walker's discussion of creativity in the dream state and the state when just waking from dreams is a fascinating part of the book, I would have liked to see some discussion of how objectively accurate intuitions are during these moments. Anecdotally, I used to joke that my best ideas came to me during this time or not at all. Sometimes, however, the thoughts just turned out to be overconfident upon more profound reflection. Is that true for just me, or is it true for people, generally speaking? Conclusion Overall, Walker's "Why We Sleep" is a must-read for anyone who sleeps: in other words, everyone. This book will not only absolve you of any guilt associated with prioritizing sleep, but it will also arm you with the knowledge to make the best choices for your physical and mental health. Walker guides you through the critical benefits of sleep, from its integral role in memory and creativity to its power to process and put to rest the day's experiences: especially the more troubling ones. While the damaging effects of lack of sleep seem exponential, Walker argues that some of the most significant benefits come in the final two hours. Thus getting eight full hours of sleep is crucial. After reading this book, you will not want to miss a full night's sleep again. To help you achieve a full night's sleep regularly, Walker provides 12 concrete steps in an appendix. Some of these suggestions are initially counterintuitive. For example, Walker maintains that a cooler room temperature of around 65F is best for optimal sleep. Already, I've been putting this and his other advice to the test, and the results seem promising. ... show more
Reviewed in the United States on June 25, 2023 by LenZen
    • Why We Need Sleeping?
Review Image by Desmond Yuen Desmond Yuen
I got interested in this book because I want to know how I can sleep better. Did I get my questions answered? I would say most of them. The book was written in 4 parts. Readers can read each part individually without following the order. That was exactly what I did. Reading the book out of order and focused on topics interested me most - jetlag, sleeping pills, dreams, and healthy sleep etc. Part 1. This Thing Called Sleep What I liked most about this book is how it dispelled the myths about sleeping. Let's start with sleeping pills. Most of the sleeping pills on the market are based on Melatonin. Bascially, it helps regulate the timing of when sleep occurs i.e. it does not put you to sleep. Taking Melatonin for jet lag does not guarantee we will be able to sleep but the timing signal does significantly increase the likelihood of sleep. Another misconception is taking alcholic drinks before sleep will help us sleep better. It turns out that it has the opposite effect. Part 2. Why Should You Sleep I used to hear stories about great people only sleep a few hours every day so they get a lot more things done versus the ordinary folks. However, even people such as Bill Gates is saying now having 8 hours of sleep is important. Sleep deprivation can be a serious problem. Workers will lose productivity if they do not get enough sleep and it may affect their health as their immune system will be weakened. A more serious scenario is when we do not have enough sleep and we are driving. Part 3. How and Why We Dream I always tried to interpret a dream especially the scary ones and find out what does it means. The author looked at dreams from a scientific standpoint. It's almost like fortune telling when we try to figure out the meaning of a dream. However, with the experimental data collected, they were able to show that people get more creative and be able to solve tough problems during their dreams. He cited examples from well known people such Thomas Edison and Paul McCartney. Very interesting findings. I need to dream more so I can be more creative! Part 4. From Sleeping Pills to Society Transformed This is the part I enjoyed most as it answered most of my questions. With the modern society we have more and more distraction everyday. In addition to the computers at work and home, we've so many electronic gadgets such as iPAD, cell phone and iWatch etc. And it is actually not healthy to spend so much time on these electronic devices before going to bed. It was also very enlightenling for me to learn that there are a number of factors affecting our sleep such as the blue night from the LED monitor, the temperature, and lighting in our bedroom etc. The author stated clearly at the beginning of his book that it is not designed to be a self-help guide and it's not written to target or treat sleep disorders. However, he did included an appendix "Twelve Tips for Healthy Sleep." The book speaks with data and facts. I learned a lot from it and I thorughly enjoyed reading this book. On the other hand, for folks not interested in all the details of the experimental data, you can still get a lot of good insights from the book. ... show more
Reviewed in the United States on August 11, 2024 by Desmond Yuen Desmond Yuen

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