Hey, I've recently began having trouble with not waking up when an alarm goes off. Actually, I think I get up and turn it off, but have no memory of it. For example, today I took a nap starting at about 11AM and had 2 alarms set for 3PM so that I would wake up and get to 3:30 class and I woke up 15 minuteness ago with both alarms turned off. It's currently 5:03 PM.

Anybody know what causes this?

Also, I only got 1.5 hours of sleep last night, but this has also happened when I've gotten a nearly full night's sleep (6 hours or so).