It varies from person to person. I cannot function a full 14-15 hours then without having take power naps if I only sleep 5-6 hours.
But you can also adjust. Like during highschool, I used to function fine off 7 hours of sleep. Now I need atleast 8-9 hours of sleep because that's what I've become used to during college.
I wouldn't give up dreaming to have "more time" - those hours are my get away from the stressful reality of the waking.
And actually, if you sleep only 5 hours or less a night, you risk gaining weight even more than those who sleep over 10 hours. I remember reading some study about it the newspaper a long time ago.




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