Nobody really knows.
I also think that it depends on the person. Different people need different amounts of sleep.
One criteria for making sure that you are getting enough sleep is to be able to awake without an alarm clock.
If you go below six hours you can use that test to be sure that you get enough sleep since I think that your brain wouldn't let you awake without alarm clock when you get a dangerously low amount of sleep.
As long as you get six hours and fell well rested you probably shouldn't worry much.
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