The Knowledge Project with Shane Parrish #131 Matthew Walker: The Power of Sleep
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Feb 22, 2022 
In this engaging discussion, Matthew Walker, a leading sleep scientist and author of *Why We Sleep*, dives into the critical role of sleep in our lives. He reveals surprising insights on sleep stages and the negative impact of alcohol on sleep quality. Walker shares unconventional tips for sleep hygiene and discusses the pitfalls of sleep tracking technology, including its potential to cause anxiety. He emphasizes the importance of understanding individual sleep needs and the benefits of adopting holistic strategies for better sleep.
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Sleep Stages
- Human sleep is divided into two types: non-REM and REM.
- These types cycle every 90 minutes, with deep non-REM dominating early and REM later.
Individual Sleep Needs
- While 7-9 hours of sleep covers most adults, individual needs vary.
- Genetic short sleepers, needing 6-6.25 hours, exist but are rare.
Check if You Get Enough Sleep
- If you'd sleep past your alarm, you need more sleep.
- The snooze button reflects a chronic sleep debt.
