I've never been officially diagnosed with anything (I've been given sleeping pills and such, but I don't like them), but I've always had horrid sleeping patterns since I was a kid. Even when I was like 6 or 7, I'd stay awake reading until like midnight or later and then wake up for school. (So getting 6 hours instead of the 10 that kids are supposed to get.) And then when I'd done this for awhile, I'd just crash. The worst was one night in high school when I came back from an event and then slept for the next 36 hours (only getting up to pee and then going back to bed, never fully awake). I still do this now, as a 38-year-old, generally getting from 2-5 hours of sleep most nights and occasionally (like once a year or so?) crashing hard. I guess I don't mind too much, as it gives me more hours to play on the internet and read and things like that, but I do feel out of it at other times, and I don't like that feeling.