[iamwil]

Lots of animals are known to do this. Animals researchers wondered how marine mammals were able to sleep. Wouldn't you drown? Turns out dolphins sleep with half their brain awake, so they can surface and breathe. The brain hemispheres then take turns.

Certain species of ducks also sleep with half the brain. They get in a circle, with the awake eye facing out, and the sleeping eye in. (I guess if they have cross visual cortex nerves like we do, it means the brain hemisphere facing out is sleeping).

https://en.wikipedia.org/wiki/Unihemispheric_slow-wave_sleep

So I guess if there's prior art, it's not a leap to think...maybe humans could try to do it too.