2 parts Complete MatureNyctophobia [ nik-tuh-foh-bee-uh ] - noun Psychiatry: extreme or irrational fear of the night or of darkness. The dark can be scary, full of strange, unseen things. Just when you think you've got a handle on it, the lights go out, and you face the reality that you were always right-you should fear the dark and what's waiting in it.