Andrew Huberman· PhD
The brain is going through these 90minut so-called altradian cycles throughout the entire day and night. Every 90 minutes we shift over from being very alert to being less alert and then back to alert again.
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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.
The brain is going through these 90minut so-called altradian cycles throughout the entire day and night. Every 90 minutes we shift over from being very alert to being less alert and then back to alert again.
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.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
What you're in training to is the release of particular neurochemicals, in this case acetylcholine and dopamine that allow your brain to focus for particular periods of time, 90 minutes or so.