I hate those, lol. I had one recently, on my first night of experimenting with lucid dreams, I dreamt that I was in bed, and then dreamt that I was dreaming and had an LD, in which I went back to bed in that dream, and woke up in my other dream where I was in bed, and then an odd looking spider shaped like a red hackey sack or something came down from the ceiling and I woke up(this time for real). These kind of dreams really mess with you, thats why I hate em, heh =P