I'm Using MediumHill 11/2/10 sprint edition 6.5 Rom. Although this has happened on MULTIPLE Roms.
Also using the standard alarm tone(default) that is stored on the device.
I have tested the overclock theory by turning off via Oct_CFG 1.5 a few nights, honestly I can't remember if it happened when I tried this, so I will continue trying. Just a little curious if anyone else has experienced this.
After being late to work twice I've had to start setting my watch alarm and my tv to turn on