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
3b (with 3c tendencies) on modified CG