I read it recently, but it might have been an old interview. He said spiders, and then he said whatever he couldn't see spooked him. Which i get.
He explained that the night before he saw a spider in his trailer and killed it before it could run out somewhere else because the thought of it creeping out somewhere after that, maybe climbing up his face while he took a nap gave him the wiggies.

When you put it like that... *shudders*