What is sleep?

Answer 1

its when your body is out like a light bulb. your eyes are shut and you dont have control of it
sleep is the process in witch your body regains energy and heals the most

Answer 2

Sleep is the way that your body resets itself. That is why if you are sick one of the ways to naturally heal is to sleep. There are many kinds of sleep. Some ways to sleep better is to not be on electronics before the time that you go to bed.