I've been practicing Lucidity for some time now, and I've even had a few dreams (some lucid, some not, but very abstract dreams) and the other day I was listening to some Mp3's as I slept, something called Brainwave Voyages. The dream I was having must have slipped my mind because all I remember was this part:

Everything in my dream was, pitch black all of a sudden, I could see nothing. Then after a while I saw two round object that looked like eyeballs, they were bouncing up and down (or maybe floating, moving up and down). Then, I saw the silhouette of a human head, I quickly noticed that the head had huge horns, then I saw whatever it was clearly, it was a Devil, or some Monster or something, I became aware that I was dreaming at that moment, and I also began to notice that my eyes were open but, what caused me to wake up wasn't because of the thing I had seen it was because I had heard myself talking in my sleep. I sat there for a few minutes and drifted back into sleep.

Ever since then I really haven't had any dreams at all. Can someone explain what the hell happened me all of a sudden?