Andrew Huberman· PhD
how much direct light exposure you get at night matters how much direct sunlight exposure you get especially early or late early morning late afternoon and throughout the day it really matters
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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.
how much direct light exposure you get at night matters how much direct sunlight exposure you get especially early or late early morning late afternoon and throughout the day it really matters
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you know it makes a lot of sense why my sleep isn't great you know it turns out that light exposure to the eyes at particular times of day really sets the whole body and brain into particular rhythms
their daytime environments are too dim their nighttime environments are too bright and this kind of misle bleading aspect of artificial light that when you see a bright bulb you think I'm getting a lot of photons is part of the problem
we evolved under this traumatic difference in day night availability of photons independent of whether or not you can quote see the Sun and it's just very clear that our the all the mechanisms in our brain and body that regulate mood are just powerfully regulated by this stuff
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.