Sleeping helps regenerate your brain cells, so if you don't get enough sleep for a long period of time, you will die. For one day without enough sleep, you feel like losing your self and it gets stronger if you continue to not have enough sleep.
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Our eyes and brain work the most, and our eyes are on all day unless we sleep. We can sit down and our muscles can take a break, but our eyes don't because we stay awake and still want to see things, and do things. Also, Sleeping helps regenerate your brain cells.