I usually get 7-8 during the week and 8-10 on the weekends. I do feel best getting around 8 hours per night. I'm a night owl but I don't have to get up til 8 during the week and can usually sleep as late as I want on the weekends.
It really, really varies for me - btwn 4 and 9 hrs per night.
There was a time when I was fine w about 6 but that's no longer the case. I think I should probably start to take a mutivitamin ever day and extra B vitamins.
I can't imagine healthy, young adults needing or wanting to take naps on a regular basis! LOL