I don't have to set an alarm. I have some natural internal alarm clock that wakes me up reliably. All I have to do is think, "OK, I have to be up at 7 tomorrow," and I'll wake up about 5 minutes before 7. I've done this since college, and it's a good thing because I really hate the sound of alarm clocks going off, buzzing obnoxiously and waking peacefully sleeping people out of sound slumber.

I've never been an easy, heavy sleeper. I wake up easily for other reasons, too, not just for morning wake-up times.