How Many Hours of Sleep Do you need?

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How many hours of sleep do you need to function? do you wake up often in the middle of the night so you need more than others? I just got 5 hours (that is considering if I didn't wake up much in the middle of the night). I woke up so incredibly tired and had a headache all day. I definitely hurt myself only getting five, but I couldn't help it last night. I have a weird sleep schedual. Sometimes it's 6 hours and sometimes it's 10 hours. I am trying to be more regular lately though at 7 or 8. I even set my alarm clock now even if I have the day off, just to train myself not to oversleep because of laziness.