Castiel wakes up screaming one night when he's sleeping at your house. He wakes you up too, and for a moment you wonder why he's woken you up when you realize that he's crying.

He still seems to think his nightmares are real. You almost laugh at this because you'd have expected him to know better, but you stop yourself as you realize that you can't have expected that of him.

Nobody was ever around to tell him that the monsters in the closet don't exist.