during a school week I need at least 4 hours to function properly, but I can function with any number of hours, depending on if I get that many hours for a certain number of consecutive days. Like I can live off 6 hours a night, but I'd have to get 6 hours a night for about 3 days in a row. The sad thing is, if I do have a night where I can get like a good 10 hours in, it makes me more tired, because I have to have 2 more days sleeping that much, and we know in college that'll never happen...