To rephrase the question, what happens while you sleep. Its easier of you take a neuroscience program for a couple of years somewhere, but the gist of what I know so far is: at night memory consolidation into the cortex occurs so your hippocampus empties up for accepting new information the next day; also some cleaning of toxic waste with CSF; and at every step there is something we dont know yet.
There is an entire course for sleep mechanisms at my university its not a topic for a 5yo
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