Can Sleep Make You Smarter?
Watch The Power of Sleep: Why Humans Can't Stop Snoozing on PBS. See more from PBS NewsHour.
(Via PBS) Sleep deprivation can cause serious health and cognitive problems in humans. In short, it can make us fat, sick and stupid. But why do humans need so much sleep? Science correspondent Miles O'Brien talks to scientists on the cutting edge of sleep research and asks if there's any way humans might evolve into getting by with less.