Normal people require 8 hours. Sorry it's true. If you sleep less than that minimum of 8 hours, the lost sleep is sleep debt. You have to make up for that sleep - sleep 6 hours, then the next day you need to sleep 10 hours to make up for the lost 2 hours. If you sleep for longer than 11 hours it makes your body more tired to continue sleeping. That's why some people go "why am I STILL tired I slept 14 hours and that should've fixed it!"
An interesting concept though is sort of BONUS sleep. Some people can do it.
If they sleep 9 hours per day, they can get little to no sleep for ONE day of the week without problems or feeling bad.
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