That sounds more like nightmares or even night-terrors, does this happen often?
Per my psychiatrist this is very common with PTSD, was he in the service or a victim of abuse, crime, etc.
He should see his doctor asap, go with him or call ahead, let them know what is happening with him.
If you don't have anywhere else to go you may have to call the police for fear he is going to hurt himself.
Good luck,