A state in which the body of a person or other mammal is in deep rest. Environmental responsiveness is reduced or even completely lost. This is the period in which the body and mind can recover from the activity of the awake state.
I'm an insomniac, I'd probably be doing a lot better if I was actually able to sleep, instead I'm spending my night on UrbanDictionary.
The physical state in which your bodie rests and replenishes it's energy (insomniacs, such as myself, do not often expeirience this, and are reading this definition @ 3:00 in the mourning and need to be awake by 6:00 to get ready for school). Sleep often comes to people in class periods such as math, science, history, P.E., and english.