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7 Secrets
1. Consistent Schedule
Wake up and sleep at the same time every day — including weekends. The internal clock (circadian rhythm) needs consistency.
2. Temperature 18-19°C
The brain needs a temperature drop to enter deep sleep. Cool room = better sleep (Walker, 2017).
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3. Cut Blue Light
Screens 1-2 hours before sleep. Blue light suppresses melatonin — the sleep hormone.
4. Caffeine: The 2 PM Rule
Caffeine has a half-life of ~6 hours. Coffee at 4 PM means caffeine in your blood at 10 PM.
5. Exercise — But Not Late
Exercise improves sleep, but not 2-3 hours before bed. It raises body temperature and adrenaline.
6. Darkness — Real Darkness
Blackout curtains or a sleep mask. Every light source — even device LEDs — affects sleep quality.
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7. The Glymphatic System
During sleep, the glymphatic system clears toxins from the brain, including proteins linked to Alzheimer's (Xie et al., 2013). Less sleep = poor cleanup.
Sleep isn't a luxury. It's a biological necessity. And it's the most powerful tool you have for your health.
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Scientific Sources
- Walker, M. (2017). Why We Sleep: Unlocking the Power of Sleep and Dreams. Scribner.
- Xie, L. et al. (2013). Sleep Drives Metabolite Clearance from the Adult Brain. Science, 342(6156), 373–377. DOI: 10.1126/science.1241224
- Hirshkowitz, M. et al. (2015). National Sleep Foundation's sleep time duration recommendations. Sleep Health, 1(1), 40–43. DOI: 10.1016/j.sleh.2014.12.010