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    why do we need sleep?

    0  Views: 610 Answers: 2 Posted: 12 years ago

    2 Answers

    http://kidshealth.org/kid/talk/qa/sleep.html


    http://www.msnbc.msn.com/id/3076707/ns/technology_and_science-science/t/why-do-we-need-so-much-sleep/#.UFaXW2_5-So

    To keep our brain functioning normally.



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