Question

why we will sleep at night?

Answer 1

we sleep at night because we do work up to morning thus we tried and in night there is silence so we sleep comfortable
thanx

Answer 2

As day turns to night, your brain makes a chemical called melatonin (mel-a-TONE-in) that makes you sleepy. Because light can wake you up, your room should be dark when you sleep. Even the light from a television or computer screen can make it harder to fall asleep. A dim nightlight is okay.