There is exactly one thing, and one thing only, that I've ever seen that prevented me from sleeping that night out of fear. I had to wait until it was light out. What was that thing, you ask?
The Doctor Who episode "Blink". If you have not seen it...for the love of God, listen to the people who say how scary it is, and don't watch it for the first time at 11 PM.
Wolfwind said:
When I was a kid in grade five or six, I recall reading a series of books called "Scary Stories to tell in the dark". I had a vivid imagination, so some of the stories did stick with me when I was laying in the dark at night waiting to fall asleep. However, it was the art in the book that legitimately made me keep the light on for a few nights before I could fall asleep. They were just etched into my mind for a while.
I dunno how scary people would find them nowadays, but if you type "Scary stories to tell in the dark" into google and go to the images, you get some samples. I could only really describe them as nightmarish.
I read those in junior high, and was legitimately terrified. That illustrator apparently wasn't informed who the target audience for the book was.