Some bird species too (Albatross, Penguins). I sometimes think that meditation could be a state of mind like this: parts of the brain awoke, parts of it asleep.

Some bird species too (Albatross, Penguins). I sometimes think that meditation could be a state of mind like this: parts of the brain awoke, parts of it asleep. With the caveat that meditation isn't really very restful, but demanding on its own.