For example: If you normally sleep 7 hours per day and one day you only get 5 hours of sleep, chances are that the next day when you fall sleep you will sleep for around 9 hours. Or if you only sleep for a normal 7 hours that day you will still need more than 7 hours the day after that to feel fully rested.
How do brains keep track of how much sleep they lost and need to make up for?
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