A childhood belief about vampires

I am very proud of myself for having a very strong scary belief and actually reasoning myself out of it when I was about 7. My older sister and I used to stay up and watch scary movies (our parent s didn't know) and she liked ones about vampires. Well, there was a cemetary really close to our house so every time we did this I would lie awake for hours just terrified that the vampires would get up from the cemetary and come and get me. I used to make my sister get in bed with me and sleep on the outside so the vampires would get her first and maybe I would have time to run away. This was a real fear. Then suddenly it hit me one night, "How would the vampires KNOW I had watched a scary movie that night? They couldn't see in our house." So there was no reason to be more scared that night than any other night, and actually I never thought about the cemetary unless I had watched a scary movie. So I just figured the vampires were not going to come and it was safe and I could go to sleep and be ok. This logic actually worked for me. I mean, how would they know?