Principals of Deep Sleep

The reason that we have to sleep

1. Categorazing and Memorizing my experiences during my sleeping.
2. Effusiong of my under-desires by dreams.
3. Relaxation of my body and brain.

The principals of Deep Sleep

 1. Warm my room for my warm body : At the nights, the temperature is decreased and my body is coller. If my room is cool, I will often wake up for  covering my body with a comforter. I don't realize the fact that I wake up last night, but It affect my sleep.