Funny you should ask.
I sleep well when I sleep, and I don't have any problems falling asleep most of the time. As long as there's a proper bed and there isn't 50 people yelling around me (and even then sometimes) I can drift off to sleep and it's really hard to wake me up. My best sleep tends to be dreamless, and if noone tries to wake me up and there's nothing to worry about the following day - I'll easily snooze off for as long as, oh, 14 hours. Just like that. I've established that 11 hours is what I need to have the "awesome, that was a good sleep" feeling.
However... with work/school pushing, and with my ever-present hobbies and distractions pulling, I often choose not to sleep and suffer horribly for it, heh. Last week I may have averaged about 4 hours/night. The rest of it I survive on coffee and dozing off at every opportunity (on the bus, for example).
But those aren't the problems.
The problem is when I sleep. And by virtue of habit, I've developed a wonderfully screwed up schedule. In the last year I've been going to sleep somewhere between 3 and 6am in the morning, to wake up around 2pm (unless I have things to do before it). How I ended up that way have no idea
