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    4. why do we need sleep?
    why do we need sleep?

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    0  Views: 621 Answers: 2 Posted: 13 years ago
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      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

      12 years ago. Rating: 4
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        To keep our brain functioning normally.

        12 years ago. Rating: 3
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