Why We Sleep — Matthew Walker

Summary in 15 minutes. We spend about a third of our lives asleep, yet few of us know how sleep arrives or what happens through the night. The body does not switch off at night. The brain learns, the mind heals and the body repairs itself. Why we sleep too little, what it costs us, and what to do when sleep will not come. Knowing helps only when your evenings change. Time to put it into practice.

Key ideas of "Why We Sleep: Unlocking the Power of Sleep and Dreams"

What Sleep Is

We spend about a third of our lives asleep, yet few of us know how sleep arrives or what happens through the night.

1. The Cost of Neglecting Sleep: Why this book matters, and why to read it with care
2. Your Two Sleep Systems: Sleep pressure and the circadian rhythm
3. The Waves of the Night: Two kinds of sleep: NREM and REM

What Sleep Does for Us

The body does not switch off at night. The brain learns, the mind heals and the body repairs itself.

1. Learning and Memory: Sleep before you learn, and sleep after
2. Mood and Dreams: Overnight therapy and creativity
3. Repairing the Body: Heart, immunity and appetite

The Price of Short Sleep

Why we sleep too little, what it costs us, and what to do when sleep will not come.

1. The Sleep-Deprived Brain: The damage you cannot see in yourself
2. How Modern Life Steals Sleep: Light, heat, caffeine and the nightcap
3. Teenagers, Students and Work: When your body clock does not match society’s
4. When Sleep Won’t Come: Sleeping pills versus CBT-I

Toward Better Sleep

Knowing helps only when your evenings change. Time to put it into practice.

1. Twelve Tips for Healthy Sleep: From the book’s appendix
2. Your 7-Day Sleep Plan: One task a day. Tick it off when done.
3. One-Page Cheat Sheet: The whole book at a glance. Save it.
4. Final Word: Respect Your Sleep: The book’s strengths, its flaws, and our advice

From the free first chapter

Matthew Walker is a British neuroscientist, professor of neuroscience and psychology at the University of California, Berkeley, and founder of its Center for Human Sleep Science. His message, drawn from two decades of research, is simple: sleep is not a luxury. It is the foundation of health.

Many cultures celebrate the opposite: students boast about all-nighters, offices admire the colleague who answers email at midnight. Walker argues that lost sleep is a debt you cannot fully repay by sleeping in at the weekend.

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