I've had many nightmares in my life. If I were to tell every single nightmare, I would need a whole subforum.
I actually enjoy nightmares. Dreams seem boring to me. My nightmares seem to be movie-ish...
Anyway, one nightmare:
Not too far from my town, there was a military facility where they were breeding aliens (from the Aliens movies).
They were in a huge depot in normal jail-like cells. There was a screen-like structure around the place, to prevent the aliens from escaping.
A few of my classmates and I, somehow, got in there one night. And I was the only one that knew what was going on, so I urged them to get out of there. One of them accidentally set the aliens free and we were running for our lives!
An army jeep drove into the structure, but it was only one of the secretaries of the facility. So she was killed by one of the aliens...
I don't know how it finished. Pity.
Another nightmare:
I was starting to go blind for some reason. But it wasn't really blindness... It was worse! I was seeing things. My mother thought I had some weird disease in my eyes and wanted me to go through a surgery to correct it.
I would look at my feet and see my dog trying to bite me. He was horrible, angry... And not there! He was right next to my mother, happy, nice!
Then I'd look at the ceiling and see blackness, cables, holes, electricity and bugs... But the ceiling was in a perfect state!
I remember I screamed and my mother hugged me, but in my eyes she wasn't my mother, but a zombie-like being...
Needless to say, that day, after I woke up, I was quite jumpy...
I have more, but meh...
One more!
* L. Coyote hides.
I was part of a team that had to get out of a maze (I believe it might have been an alien test). The maze had some spots where you would get thrown through dimensions... While it was risky, we needed to get home (in another dimension)!
We eventually got separated, and I found one of the dimesion hopping spots... I was thrown to another dimesion, but also in a maze. So I figured I was taken to an alternative world in the same spot (maze). So I tried finding my team, but I couldn't contact them through dimesions...
Then I got thrown out of the maze, into a small room with an old lady and a girl... And I had to live with them, but I wanted to go back to the maze to save my team...
Btw, I didn't know anyone in my team...
/ 
