Man, that is weird. I must have imagined hearing my alarm go off this morning. I got up, turned off the alarm, and went about my routine. After about 30 minutes of doing stuff, I check the time to see how long I have before my Skype call for work, and it's only 2 minutes after the alarm purportedly went off. It's an intermittent alarm, not continuous, so it is entirely possible and the only explanation. The alarm is still set to the expected time.
So instead of getting 5.8 hours sleep, I only got 5.3.
So instead of getting 5.8 hours sleep, I only got 5.3.