It’s late and you’re in your favorite, cozy pajamas. You get in bed and pull up the warm comforter. You turn out the light and are just about to drift off to sleep when you hear a noise coming from the attic. You sit up to listen, but it quickly goes quiet again. You lay back down and close your eyes, and just as you fall asleep, the noise is back, this time it’s coming from inside the wall.
You have a visitor — an unwanted visitor.