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Why must we sleep? ... However, they do know what goes on within our body during various stages of sleep, and they can explain where dreams fit in to our nightly slumber.
The first theory pertaining to why we need sleep is called the repair and restoration theory. This theory states that our bodies and brain need time to rest, but is often disputed by the fact that our bodies can be rested by just laying down and further more, our brains become very active during sleep. ... This theory would also account for the fact that different animals need different amounts of sleep (a bat needs approximately twenty hours of sleep a day, while a horse needs only three or four).
Approximate Word count = 455
Approximate Pages = 1.8
(250 words per page double spaced)
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