What can still frighten you. Not only in dreams. In everyday life or films or books. One of mine is clowns.
The only things that really frighten me are tornadoes. @Jeff Tracy what are ikle pydees? Is that another example of the Englishters overusing vowels?
When I lived in the Midwest it was Mantis and Junebugs. Both loved me as much as I hated them, which was lots! Here its just heights, which is easily avoided. Nightmares used to be a problem, until maybe thirty years ago, when I learned how to terminate a dream at will.
Yeah, I learned to control my dreams and end them when I need to. Something about a war makes it a necessity for some people.