Nightmares.

I don't know whether it's because of my anxiety, all the accidents I've been seeing recently, or the fact that I decorated my apartment for Halloween but last night I had the WORST nightmare. It lasted ALL night and it was a very in depth storyline. It started out with this very handsome guy in all of my classes, he and I started talking and even dating. Then I got into his house somehow and he had shelves upon shelves of all this stuff. Pictures of girls and DOZENS of their belongings, under each shelf of memoribilia there was a tag with the girl's name, her birth date, and what I had assumed was her death date.
Then I stumbled across my shelf. He had tons of pictures of me, including my headshots, my brush, some of my make up, various clothing, etc. I looked at my name tag and it had said the end of my life was today, as soon as I saw that I looked out the window and he was fiddling with his fussy lock on his screen porch door, I had to sneak out! As I was leaving, I looked at his cat, it had pure fear in its eyes, so I picked up his cat (which is actually my cat in real life) and then I woke up. When I woke up my heart was beating so fast, I was sweating, and I feel like I had just been running for my life.

What do you think nightmares really mean?