Andrew Huberman· PhD
However, there's no escaping the fact that human beings are a diurnal species. We were designed, literally, our cells and the circuits of our body were constructed to be awake during the daytime and asleep at night.
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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.
However, there's no escaping the fact that human beings are a diurnal species. We were designed, literally, our cells and the circuits of our body were constructed to be awake during the daytime and asleep at night.
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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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Nonetheless, human beings are diurnal. We were really designed to be awake mostly in the day and asleep at night.
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.