Andrew Huberman· PhD
It really can reset our sleep-wake rhythms.
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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.
It really can reset our sleep-wake rhythms.
Every Sunday: the week’s new conflicts and verdict changes — and nothing else.
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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the most powerful thing that's governing when you want to be asleep and when you want to be awake is light, and in particular, it's governed by sunlight
I always thought that light was the primary zeitgeber, the primary light- - Yeah, but a lot of people think it's food. A lot of people even sometimes mentioned social interaction. - Have they read the literature? - I agree with you. I totally agree with you. - I mean, my understanding is that light is the most powerful driver-
Light is going to be the best way... More light, awake. Less light, asleep.
That block of sleep and when it falls within each 24 hour cycle is governed by a number of different things. But the most powerful thing that's governing when you want to be asleep and when you want to be awake is light. And in particular, it's governed by sunlight.
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.