I cannot wake up at night any longer. It's weird -- I've had to start telling myself to do so but that isn't working. I've got a great 'alarm clock' (it's an mp3 file that I can re-edit and put on my mp3 player) and have IEMs that don't fall out of my ears throughout the entire night but they're not of any use anymore because I just don't wake up to do my WBTBs. I've had a few (as in 3) late nights but that's as of recent.

Did my REM stage change perhaps or is there something else going on? Should I edit my alarm to ring for a longer period of time?