It all depends on the day. If I have a morning class (3 days of 8am classes this quarter, but I get a 4-day weekend!) I'll set my alarm, though I have been known to wake up at the right time on my own. I'll also set it if I'm taking an afternoon nap on days when I have something to do at a particular time, but I'm feeling dog-tired. If my alarm clock has been acting iffy and I absolutely need to get up on time, I'll set my cell phone alarm, too. Nothing like waking up to Link's blood-curdling scream! XD