Most of us are basically non-functional after a period of insomnia, but some folks are perfectly fine consistently getting four hours’ sleep a night. @KnowableMag looks into the genetic wiring of these lucky people, and what it can tell us about sleep itself.

https://knowablemagazine.org/content/article/mind/2024/genetics-of-people-who-need-little-sleep

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Fitbit says I've been averaging 5.5 hours of sleep per day for 5+ years. That it's even that high is due to long-sleep days due to illness, activity recovery (e.g. after multi-day music festivals) and the effects of beta blockers.