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Sleep isn't rest — it's when your brain takes out the trash. Literally.
💡 Sleep clears toxic brain waste (including Alzheimer's-related proteins) and protects metabolism. One week of short sleep makes healthy people look pre-diabetic.
Attia dedicates an entire section to sleep, calling it a non-negotiable pillar of longevity. The science is clear: consistently sleeping less than 7 hours is associated with increased risk of every single one of the Four Horsemen.
The mechanism is partly understood: during deep sleep, your brain activates the glymphatic system — essentially a waste-removal process that clears toxic proteins, including beta-amyloid, the plaque associated with Alzheimer's disease. Skip sleep, and the trash doesn't get taken out. Night after night, the waste accumulates.
Sleep deprivation also wrecks your metabolism within days. Even one week of 5-hour nights makes healthy young adults look pre-diabetic on glucose tests. It spikes cortisol, increases hunger hormones, impairs decision-making, and suppresses immune function.
Attia's practical advice: prioritize sleep consistency (same time every night), keep the room cool and dark, avoid alcohol (it fragments sleep architecture even if it helps you fall asleep), and treat sleep disorders aggressively — untreated sleep apnea is a major cardiovascular risk.
Source: Outlive: The Science and Art of Longevity — Peter Attia