Depends on your definition but several... https://en.wikipedia.org/wiki/Unihemis... | Hacker News

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		FuriouslyAdrift 4 months ago \| parent \| context \| favorite \| on: Sleep all comes down to the mitochondria Depends on your definition but several... https://en.wikipedia.org/wiki/Unihemispheric_slow-wave_sleep

jjk166 4 months ago [–]

According to the definition we're using, that counts as never sleeping. Half their brains are awake at any given time.

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