Comment by FuriouslyAdrift
5 days ago
Depends on your definition but several...
https://en.wikipedia.org/wiki/Unihemispheric_slow-wave_sleep
5 days ago
Depends on your definition but several...
https://en.wikipedia.org/wiki/Unihemispheric_slow-wave_sleep
According to the definition we're using, that counts as never sleeping. Half their brains are awake at any given time.