I don't know if this has been on here before but I searched in the topic search and didn't find anything. Go here to understand it more than I can tell you:

http://forums.gamedaily.com/index.php?showtopic=48397

I had a better site about it but I forgot what it was. There was a forum I read this on a little while ago about this guy that was doing it and he said he experienced periods of "lost time". He burned a CD and layed on his bed with head phones for what seemed like minutes, but he would wake up hours later. I don't know about this part but he also mentioned "out-of-body" momemts occuring sometimes. Has anyone heard of this stuff?

Got a 60 minute track of white noise in the theta wave. Once I get it burned, I'll go to sleep, put it on repeat while I sleep and report in when I wake up. See if I noticed/feel anything different.

edt:

Nothing really. beats me...