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15 bytes removed ,  03:53, May 16, 2007
The mind does not turn off during sleep. What do you think dreaming is?
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Sleep is a bodily state in which the body rests and the mind turns off. Almost all animals must sleep to survive, but scientists do not know why.
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Sleep is a bodily state in which the body and mind rest. Almost all animals must sleep to survive, but scientists do not know why.
    
[[Category:Biology]]
 
[[Category:Biology]]
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