Is not enough sleep bad for your health?

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Definitely. Sleep deprivation can adversely affect the brain and cognitive function and causes an impairment of ability. Should be getting atleast 7 hrs of *quality* sleep a night as a student ( that means not looking at any screens atleast an hour before bed, try reading a textbook or free reading book the hour before bed instead of scrolling through twitter, facebook, or some kind of article on a phone or laptop screen).