Check out CrazyInsane's CANWILD method here. What I do is wake up for a WBTB and then turn on an mp3 that is 30 minutes of silence followed by a beeping sound. I just use my PSP and keep it near my bedside so I can quickly turn on the mp3 and go back to sleep. 30 minutes later the beep goes off and, ideally, I should wake up without moving.

Maybe this is the kind of thing you are looking for?