What has been proven in laboratory rats is that insufficient sleep decreases body temperature. The consequent loss of body heat increases their appetite, overcompensating for the energy lost. What hasn't been proven is that people will increase body fat by not getting enough sleep. A recent ethnographic study about the adjustments freshmen make when moving to campus found getting enough sleep in the residence halls to be the most difficult and challenging adjustment they had to make. Also remember the effect of sleep on physical and mental performance.
Memory skills work best when the brain has had sufficient rest.
If you have to stay up late, be prepared to take a nap or sleep in the next day. If your sleep is constantly disrupted, then take the necessary steps to change your sleeping arrangements or the cause of the disruption. The University of Arizona. Board of Regents, Copyright 2000.