Sleep has a number of benefits, and a healthy night of it is always a cherished prize.  Though we are asleep, our bodies are hard at work repairing themselves.  To help you stay asleep, your brain becomes less receptive to outside light or sound stimuli, but if you look inside the brain, you will find the brain itself is quite active (Paraphrased from a Washington University professor). People with sleeping problems often visit doctors certified by the American Academy of Sleep Medicine (AASM).