Question

what is the need to sleep?

Answer 1

Researchers have also shown that after people sleep, they tend to retain information and perform better on memory tasks. Our bodies all require long periods of sleep in order to restore and rejuvenate, to grow muscle, repair tissue, and synthesize hormones.

Answer 2

The need to sleep is to get our mind refreshed. It lowers our stress and we can get relaxed at that time. All the tensions that you have will not disturb you at that time. You will not look tired by sleeping.
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