I agree that it's not enough for the majority of people (myself included), but I have a great aunt that has, for her entire life, slept four hours a night (midn

I agree that it's not enough for the majority of people (myself included), but I have a great aunt that has, for her entire life, slept four hours a night (midnight to 4am). She's a retired school teacher, no commitments that are keeping her awake, and that's still the schedule she keeps. She apparently just doesn't need as much sleep as most people do.