What is the minimum amount of sleep required...?

... what is the minimum amount of sleep needed on a regular basis in order to function properly and/or required to maintain physical and mental health? I was wondering because it is sometimes "normal" for me to sleep 5 hours or less, especially when I am busy. If I sleep less than 5 hours a night,... show more ... what is the minimum amount of sleep needed on a regular basis in order to function properly and/or required to maintain physical and mental health?

I was wondering because it is sometimes "normal" for me to sleep 5 hours or less, especially when I am busy.

If I sleep less than 5 hours a night, is it possible to "catch up" on my sleep later to make up the difference? Can a person sleep less than 5 hours a night without having a negative impact upon ones health?

Thanks!
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