Sleep (noun)
1) Something every human being is deprived of.
2) The only mechanism that keeps human beings sane.
3) An activity that should take up eight to nine hours of our day.

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SLEEP
Sleep (noun)
1) Something every human being is deprived of.
2) The only mechanism that keeps human beings sane.
3) An activity that should take up eight to nine hours of our day.