I have a phobia of being left alone in the dark.
And of tetonic/volcanic activity (although I live in the North)
And of aliens. I've heard low vibrating sounds at night, and good god, it's scary as crap. I've also heard screeches in the night once. And sometimes, I have these twitchy moments where my eyes just go into REM for a second.
Ok, now I'm going to go hide in my bedsheets. All this description of unexplained activity is making me paranoid.