Virtually all living organisms sleep, or its equivalent. But it has been a puzzle why. Surely spending a big part of every day unconscious can’t have much survival value. But scientists have now discovered that sleep is when our bodies repair themselves and when our brain is rejuvenated and, literally, cleansed.
Time has a fascinating article on the subject, linked and excerpted after the jump. Type-A personalities who brag about how little they sleep so they can work more, party animals who stay up all night, commuters who stay up late and get up early, and college students in general would do well to read it. [Read more...]