Andrew Huberman· PhD
once you get to later in midday, you’re in the circadian dead zone. Sunlight still have positive effects but not the ones I’m referring to here.
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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.
once you get to later in midday, you’re in the circadian dead zone. Sunlight still have positive effects but not the ones I’m referring to here.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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midday sun which contains its bright light but you see it as white contains all of those wavelengths at equal intensity so the middle of the day is the so-called circadian Dead Zone in the middle of the day bright light triggers the activation of the of the other opson the melanopsin which increases mood increases feelings of well-being has some other consequences but you can't shift your circadian clock by viewing the sun in the middle of the day because it's in the Circadian Dead Zone
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Long-term morning sunlight reduces age-related macular degeneration risk.
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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.