Andrew Huberman· PhD
Lymphatic drainage from the brain occurs during sleep.
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The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
Lymphatic drainage from the brain occurs during sleep.
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Brain imaging reveals the glymphatic system is very active during deep sleep. And there's this kind of wash out of the glymphatic system.
the trash collector that cleans your brain during deep sleep missed its route.
during sleep, a "cleansing process forcibly flushes out waste products" in the human brain.
there is a huge system of vessels of Plumbing in your brain that keeps your brain a car wash essentially a deep clean while you are sleeping this is called the glymphatic system
Brain swells during sleep, fills with CSF that pushes toxic waste out of brain.
10 minutes of bright outdoor light within the first hour of waking anchors the circadian phase and improves sleep onset that night.
Morning sunlight exposure shifts the cortisol awakening response forward, improving daytime alertness.
Long-term morning sunlight reduces age-related macular degeneration risk.
Sleep regularity predicts all-cause mortality more strongly than sleep duration.
Tracking deep sleep on a wearable accurately reflects EEG-measured slow-wave sleep.
Caffeine has a half-life long enough that consumption after 2pm measurably degrades deep sleep in slow metabolizers.