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A couple of quick google searches would tell you that the important part of sleep is the REM (Rapid Eye Movement) sleep. REM stands for rapid eye movement. During REM sleep, your eyes move quickly in different directions. That doesn't happen during non-REM sleep. Usually, REM sleep happens 90 minutes after you fall asleep. The first period of REM typically ...


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I think the reason is primarily, that it is more quiet (the chance is very low that other people are disturbing your sleep) in the night as well as it is also dark. Keeping in mind, that the brain "gets tired" due to some proteins (melatonin) and in contrast, being more awake during the day, it seems to be just logical that the sleep in the night is ...



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