I always set my alarm clock, but wake up before it goes off. I just like to set it just incase. I hate the sound of the alarm when I'm sleeping so I wake up every few minutes just to see how close to the time it's getting -- finally, about 5 minutes before it is about to go off, I just get up. I hate it because for the hour before I get up I never get any sleep because I'm so terrified the alarm clock is going to go off. But if I don't set it, I wouldn't sleep at all because I'd be too paranoid that I'd be late for work!