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Why do we feel asleep at night mostly? I tried not to sleep but I could not resist my sleep at night.

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closed as too broad by David, James, anongoodnurse, another 'Homo sapien', canadianer Apr 10 '17 at 5:07

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ You may be interested in this Q&A about the evolution of sleep. Currently your question could be a book title. It's a tad broad. $\endgroup$ – James Apr 10 '17 at 3:27
  • $\begingroup$ Do you mean "feel sleepy" or "fall asleep"? Some of it is simply habit: I tend not to feel sleepy until midnight or so, but when I've shifted my sleep pattern towards early rising (which requires a concerted effort :-)), I would start to feel sleepy earlier in the evening. $\endgroup$ – jamesqf Apr 10 '17 at 5:51

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