Basically we have a tiny little gland in the middle of our brains that controls when we sleep and when we are awake as well as many other things. And many of us are programmed, as it were, to either be night owls (want to go to sleep late) or larks, where we want to go to bed early.  -   Dr. Kryger     Quotes
Basically we have a tiny little gland in the middle of our brains that controls when we sleep and when we are awake as well as many other things. And many of us are programmed, as it were, to either be night owls (want to go to sleep late) or larks, where we want to go to bed early. Dr. Kryger
 Sleep