Nightmare

[Shattering -]

Quite often, however you would need to analyze your dream in order to understand it.
Screaming/Talking while dreaming is nothing uncommon and doesn't really mean it's a nightmare...

I've seen and heard people scream, cry, laugh, actually express any emotion while dreaming, simply because the memories which are being processed by the brain in the dream/sleep are intense or of significant nature for the dreamer...

Thank you. My dream was a real nightmare.

In my dream I was watching a movie with a friend, and suddenly I was dragged along the floor, like in the movie Paranormal Activity. Then I started scream.

Probably a random nightmare?