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A member asked:
Why does the body only grow and repair when we are asleep?
A doctor has provided 1 answer
Sleep: No one really knows historically why we spend a third of our lives sleeping but the theory is that it gives the brain, muscle, all organs to relax and rejuvenate and probably has some evolutionary advantage as sleep deprivation for more than 7 days can be fatal.
Answered 9/6/2013
4.9k views
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