I remember having Sleep Paralysis when I was younger, no scary dreams, just unable to move. Although once I had my head in the pillow when that was happening and I almost could not breathe.
I also have a friend that once had a bout of it where he saw Slender Man just flying around in his room. She said it was more funny then anything else.
Ether way, do you have any problems with it? Or any stories maybe?