Andrew Huberman· PhD
Ultradian cycles are these 90 minute cycles that we go through throughout sleep and wakefulness that are optimal for learning and attention.
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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.
Ultradian cycles are these 90 minute cycles that we go through throughout sleep and wakefulness that are optimal for learning and attention.
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The brain is going through these 90 minutes so-called "ultradian cycles" throughout the entire day and night.