Question

why the brain needs sleep?

Answer 1

Brian is the part which works non stop so to have a rest in order of having stable state of mind sleep is necessary at for at least 4 hrs for mind.

Hope it helps.

Answer 2

when we are sleeping.the brain is anything but inactive .during sleep neurons in the brain fire nearly as much as they do during walking hours - so it should come as no surprise that what happens during our resting hours extremely important to a number brain and cognitive functions
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