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You spend about one-third of your life asleep, but no one is sure why this is necessary. During deep sleep, the body produces large amounts of growth hormone that help to repair or replace damaged cells and tissue. Sleep also speeds healing. While you are sleeping, the brain remains very active.

The body goes through stages of being very limp and relaxed, and other
stages when the eyes move about beneath closed eyelids.

Dreaming takes place during this rapid eye movement period, called read more...

Tags: sleep, healing, body

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