Too tired to think, so here's a brief bedtime chat with Miss O...
MISS O: Hey, who put my comforter on me last night?!
ME: I don't know. You probably pulled it up yourself.
MISS O: NO! Both of my arms were under my sheet, so I couldn't have done it.
ME: Well, you probably did it in your sleep.
MISS O: NO! I would never do that. I don't like my comforter on me!
ME: Well, then, your mom probably did it.
MISS O: Humph!
(Psssst... I did it.)