What you're experiencing is, as it sounds as though you know, sleep paralysis. I used to have this & it is terrifying. I would try to cry out for help, & I would think I was crying out, but my wife (who was right next to me) would not hear anything. So I presume I wasn't actually making any sound. What I finally learned to do was to focus my attention on one finger & keep trying to move it until it would actually move. Then I'd go on to another finger. Generally by this time I had awakened. I also told my wife that if she ever did hear me making any kinds of sounds in my sleep to awaken me.

I haven't had one of these "attacks" in quite some time now. I've been on 120 mg. of Cymbalta for about 2 years now. I don't know if the Cymbalta has had anything to do with the fact that I haven't experienced this in some time or not. Unfortunately, I can't recall whether or not the incidents stopped around the time I began taking the Cymbalta.