Ideal sleep is good for health for a few reasons. One, for example, is that during sleep, your brain reorganizes itself to get ready for the next day. Also, the body needs to slow down to repair itself from a day's work. The absence of sleep can cause drowsiness (obviously), and then after many nights of lost sleep hallucinations occur. Eventually, sever lack of sleep makes people lose track of the things around them and can die. Also, people grow much more in their sleep than when they are awake.
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