We don't entirely understand why the body requires sleep but studies show that sleep deprivation (less than 8 hours of sleep) and, interestingly enough, over-sleeping (more than 9 hours of sleep) increases inflammation, causes obesity, increases insulin resistance (major cause of acne), and induces stress - all things that negatively affect the way you look.
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why do you think they call it beauty sleep. It get rid of the wrinkles and pimples and the bags under your eyes, and it makes you smarter :)