Andrew Huberman· PhD
I think everybody should be taking care to get adequate sunlight and to avoid bright light at night throughout the year if possible.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
I think everybody should be taking care to get adequate sunlight and to avoid bright light at night throughout the year if possible.
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I happen to subscribe to the idea that we want as much bright light as we safely can tolerate during the day ideally from sunlight in order to set our circadian rhythm
it's also clear that we should all be avoiding really bright extensive really bright nighttime light exposure
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.