Why should there be a night

Time is one of the conditions lived by every creature brought to life by the creator, whether that time is short or the longest in this life. In life in this world every creature must undergo any time that is always approaching each individual. say like time of day or night. At night all the names of life will remain at that time.  One of the times that is often faced by every creature is at night. Why must it be at night, is daylight not adequate for human life? When this happens, it will backfire on human life because at night it's time to rest the body because it's tired of working during the day, night is the time to gather energy again after being spent in the daytime. This is one reason some people say that night is the time after the sun goes down to sunrise, then that's the chance for humans and other animals to rest.  Scientifically the night can be defined as the period (time) in which a place is in a position that is not facing the sun, and therefore darkens. When the hemisphere experiences night time today, the other hemisphere will experience time during the day. Nights are sometimes defined as the time between the sun sinking on the horizon (the western horizon) and the appearance of the sun on the eastern horizon the next day. Now with the night then complete and perfect the situation in this life. But it will get a deficiency in this life if there is no night. Well, that's why it's made night. Do you understand it? Yes, of course you understand. Why does it have to be night? Such is the description of the night for the lives of humans and other beings in this world. Thank you very much.