Andrew Huberman· PhD
And don’t forget that there is sunlight on cloudy days. It’s especially important to view that sunlight on cloudy days.
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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.
And don’t forget that there is sunlight on cloudy days. It’s especially important to view that sunlight on cloudy days.
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It’s especially important (for sake of daytime mood, alertness and night time sleep) that you get sunLIGHT in your eyes on overcast days.
When it’s gray & overcast outside, those are the days you especially need to get outside and view sunlight to maintain your sleep-wake rhythm and health.
It just takes longer to set your clock (30min minimum).
The point is to get photons in your eyes which still occurs on overcast days. You just need to be outside longer. That is plenty bright.
I want to make sure that uh we didn't Overlook what was the major conclusion of the firefighters
People will say there's no sunlight where I live. And I remind them that even on a very overcast day, there's a lot of photon energy coming through, but the long wavelength light is cut is cut off.
Morning sunlight thing is pretty important, especially on overcast days. But um for everyone, we are circadian creatures.
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.