Whatever sleep does, it's something nature has had a tough time optimizing out despite the extreme vulnerability it creates and the sacrifice of a little under half an organism's waking time.
That should tell us it's something incredibly important that's hard to do any other way.
Edit: on the other hand... if Earth had two suns and rarely had periods of darkness, you wonder if maybe there would have been more evolutionary pressure to find another way.
That should tell us it's something incredibly important that's hard to do any other way.
Edit: on the other hand... if Earth had two suns and rarely had periods of darkness, you wonder if maybe there would have been more evolutionary pressure to find another way.