Question

why do humans need sleep atleast for 8 hrs?

Answer 1

beacause of tiredness of body body needs sleep to boost it self fr new day

Answer 2

bcz the humans workout for whole day and they need to give rest to their body. Also there is another reason related to this......our eyes,mind,muscles...etc are used up....i mean they are worked in dufferent manner for humans so they should be given rest......and come to your point that why human need 8hrs sleep that is only an estimate,i.e.8hrs sleep......according to scientists 8hrs sleep is essential or effective for human to recharge their power,energy.
Hope this will help !!!
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