I used to have this dream a fair bit when I was working at my last job and occasionally in college when I had certain professors. It tended to be rather violent, with me being chased or attacked and not being able to scream. During the dream and after waking up, I never really cared so much about the attack itself, but the fact that I couldn't do anything about it was deeply troubling.
I'm not much of a believer in dream interpretations, but I do think they're loosely tied to reality, in this case feeling stifled.