Do you get the recommended 6.5 hours of sleep per night? More? Less?
Do you normally go to sleep before midnight?
Are you an insomniac?
Is it starting to show?
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When I don't have classes (holiday or a break in between semesters) I usually rotate. Example: Day one: sleep by 11pm Day two: sleep by 3am Day three: sleep by 6am Day four: sleep by 9am Day five sleep by 1pm Ect...