I occasionally have “bad dreams”, but this dream I had last night really was a nightmare.
I casually enter my room and first see my family. They are all staring at something, and suddenly they all shriek in horror. I turn around to see what they’re looking at, but that part of the room is like a dark abyss and I can’t see very well. From what I can tell, something is moving, or being moved, but I don’t see anybody there. I have this feeling that it may be some kind of invisible demon, but I’m not really scared of it. I try to mobilize someone to have a closer look, but they’re all frozen in fear. I decide to enter the darkness alone. I “know” that a particular spot is in the room is inhabited by the demon. I put my hand over it and it feels particularly warm and moist. The others are still scared stiff, so I decide to shed some light on the matter. I leave the darkness and press the light switch (which doesn’t work but I don’t notice), and open the shutters and window. I see the sky, it’s day but cloudy and unnaturally dark for daytime. I see that a nearby large shed has collapsed right next to the window, and on top of the “ruins” there is a form I can’t immediately make out. It (a black cat, as it turned out) jumps straight inside the room through the window, and that’s as far as I can remember.
It disturbed me a little, but it wasn’t really all that frightening. I’m just glad I didn’t see the demon!
Edit: By “bad dreams” I mean something like the this: I’m with a female desert-dweller who is angry at me for some reason. She draws a poisoned needle and I struggle with her but she is very strong and manages to stick me in the leg. I know I’m as good as dead. Although I died in this one, I didn’t bother me in the least.