I’ve had this happen before. Woke from a scary dream, and couldn’t speak or move. Remember feeling very scared at first and then fell back to sleep. When I woke up, I thought I dreamt everything. Apparently, this is a real thing. There are other posts on this forum I believe, about sleep paralysis.
http://forums.psychcentral.com/sleep...paralysis.html
I found this thread. I think this is where I first discovered others with the same experience.
Sans