Andrew Huberman· PhD
From nine to about 16 hours is what we would call phase two. And that's when dopamine and epinephrine levels tend to subside a bit compared to the earlier phase one part of the day and serotonin levels start to increase.
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.
From nine to about 16 hours is what we would call phase two. And that's when dopamine and epinephrine levels tend to subside a bit compared to the earlier phase one part of the day and serotonin levels start to increase.
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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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