The title of this article seemed intriguing to me. I thought I would just pose a question based on it: would you say any of these monsters gave you nightmares whatever medium you're familiar with them in (e.g. book, film, TV).
Mine was Frankenstein's Monster. Although I hadn't read the book yet, when I was nine I had a nightmare where Victor Frankenstein's monster was getting ready to shoot me with two pistols! I have always been fascinated with the Monster, and so at that time I was familiar with the character in popular media such as movies and TV. What actually inspired that dream was a television sitcom of that time based on the Frankenstein's Monster character. The series didn't run long. Honestly, I don't remember the name of it. But the monster didn't look so much monstrous looking as he did simply a huge ugly old man. But at nine when you have such an ugly old man chasing you down with two pistolas in your dreams that can be pretty damn scary! When I finally read the Mary Shelly's novel years later, it wasn't so much the monster that gave me nightmares than it was the cruelty and bigotry of the humans that chased him off.
Read the article at the link below and let me know if any of these monsters (or others like them) has ever gotten into your dreams.