just a minute ago I opened up "sound recorder" on my computer and recorded a minute of nothing (no microphone plugged in) and clicked "decrease speed" until it wouldn't let me anymore leaving me with 16 minutes or 960 seconds of blank .wav file. I saved it 3 times as 1.wav, 2.wav, and 3.wav, all the same 16 minutes of blankness. Then I recorded myself saying "THIS IS A DREAM, YOU ARE DREAMING... RIGHT NOW" and saved it as 4.wav. I put the files 1, 2, 3, and 4 in my iTunes library, then in a playlist called "dream notifier". I went into settings on my ipod, turned off shuffle, and uploaded the playlist to my iPod. I connected my iPod to my iPod speaker apparatus and set it to the volume I saw fit. I then set my alarm for 4 in the morning and plan on going to sleep between 12 and 1. And I'm going to play just before I go to bed, and then WBTB at 4 and play it then as well. It will go through each 16 minute blank wavs in order and therefore play my voice "you are dreaming now" after approx. 45 minutes.

I think this might work

If you want to try this yourself, and don't have a mic you could probably find an alternative sound file for your "4.wav", but the first three should work fine.

If you don't have an iPod+speaker you could just play it on your computer (I personally just don't like to leave comp on all night)

And there yuh go, haven't tried it yet. Hope it works. You should try it too. And tell me if it works for you! :}