Your brain is like a trash can. Throughout the day it fills up with garbage, and at night that garbage is slowly removed. If you don’t get enough sleep, only some of the garbage gets taken out. Over time, it builds up until your can is almost always full. A full can is bad and makes you fall asleep or hallucinate.
However if you sleep lots and lots, your trash-can can’t get under 0% full. It will always only hold a certain amount of garbage.
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