Mechanism walk · Body

What the body repairs in deep sleep

N3 is not just 'sleeping deeply'. Growth hormone, brain clearance, next-day pain all sit here.

3 stops: the architecture → what N3 repairs → what wrecks it

1. 01Four stages · the night's architecture
2. 02N3 deep sleep · restoration + memory + brain janitor
3. 03What wrecks architecture · alcohol / caffeine / age

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