Brain cells responsible for keeping us awake identified

Brain cells responsible for keeping us awake identified: Researchers have identified the group of neurons that mediates whether light arouses us and keeps us awake, or not. They report that the cells necessary for a light induced arousal response are located in the hypothalamus, an area at the base of the brain responsible for, among other things, control of the autonomic nervous system, body temperature, hunger, thirst, fatigue -- and sleep.