Something to readWorkload & wellbeing
Why We Sleep
A book about unlocking the power of sleep and dreams: what a full night does for your memory, mood and health, and what it costs to cut it short
Why it’s worth your time
Sleep is often the first thing to give when work piles up, and this book makes a vivid case that it's the worst trade you can make. Matthew Walker, a neuroscientist who has spent his career studying sleep, explains what a full night does for learning, memory, mood and health. Read it with a skeptical eye: a detailed 2019 critique argues that some of its starkest claims go further than the evidence.
How to protect your sleep when work piles up
The book · About 9 hours of reading · Buy or borrow
How to get it
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- Start with the part on what sleep does for you.
The book has four parts. The second, on what sleep does for the brain and body, is the part you're most likely to feel at work. Walker's tips for sleeping better are in a short appendix at the end.
- Set a time to stop work tonight.
Pick a time to close the laptop and stop checking messages that leaves room to wind down before bed, and keep it for a week. If people might expect late replies, tell them when you go offline and how to reach you if something is truly urgent.
Good moments for this: before a crunch weekafter a run of late nightswhen you're running on caffeine
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Small actions add up. Truest helps you find the next thing worth doing, make the space to do it, and keep a record of your progress. It’s a private place to work on your career, and it’s yours, not your employer’s.
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Making it work for you
Every workplace is different. Here’s what to think about before you start, and what might get in the way.
Things to think about
Where late messages are rare, a stop time can stay a private habit; where they're normal, it tends to hold better once people know about it.
What might make this harder
Ask your manager what genuinely needs a fast answer and agree a cutoff for the rest. Norms and protections vary by employer and by where you work, so start from what your team already accepts.
Questions people ask
What is Why We Sleep about?
Why we dream, what sleep does for brain and body, and what goes wrong when people and societies cut sleep short. It ends with practical tips for sleeping better.
Is Why We Sleep accurate?
Partly. In 2019 the independent researcher Alexey Guzey argued, in a long critique, that several first-chapter claims overstate the evidence. Walker has since replied on his blog to questions about the book, in answers Guzey notes don't respond to his essay directly, and says a full set of corrections now appears in a second edition.
Who is Matthew Walker?
A neuroscientist and sleep researcher. He wrote the book while running a sleep lab at UC Berkeley; his own site now lists him as a professor at UT Dallas, where he directs sleep research at the Center for BrainHealth.
Is there a shorter version of Why We Sleep?
Walker's 2019 TED talk, Sleep is your superpower, runs about 19 minutes and covers the core ideas, including what sleep does for learning and memory.
What it says, and how it holds up
If sleep is the flexible part of your day, the hours that give when work doesn't, this book argues the reverse. Matthew Walker, a sleep scientist who spent years running a lab at UC Berkeley, wrote it in 2017 to make that case. He treats sleep as the foundation the rest of the day stands on. Across four parts he covers how sleep works, what it does for the brain and body, why we dream, and what gets in its way, from sleep disorders and modern habits to how medicine, schools and employers treat it.
The book's message is stronger than some of its evidence. In 2019 Alexey Guzey, an independent researcher, published a detailed critique arguing that several claims in its first chapter, including links between short sleep and cancer or a shorter life, go beyond what the studies show, and that one chart was shown with data left out. He is explicit that he isn't arguing sleep doesn't matter, and he checked only that chapter. Walker later posted answers on his blog to questions raised about the book, covering several of the same points; Guzey notes the post doesn't respond to his essay directly, and Walker says a corrected second edition is now in print. Guzey's critique also collects accounts from sleep doctors and coaches of the anxiety the book can stir up, an awkward side effect for a book about falling asleep. The case for protecting your sleep doesn't depend on the book's starkest numbers, and those are the part to hold loosely.
If your trouble is falling or staying asleep rather than finding the hours, an alarming book is the wrong first step; a doctor, or a structured insomnia program, is a better one. And if the hours simply aren't there because of how much work you carry, the book will persuade you without moving a single meeting. Treat it as a reason to raise your workload with your manager, not a substitute for doing so.
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Picked by Truest and described in our own words. The original belongs to its creator. Last updated October 9, 2026. We sell a career membership; where that’s relevant above, we say so.