What am I doing?!?

I think we all know that strange things happen while we are sleeping. We toss and turn, and dreams can make us wake up laughing, crying, or scared out of our minds. But get this... two mornings in a row I have awaken to discover that in the course of the night I have take the pillow case off of my pillow! I sleep with three pillows, all of which are very different. Yet, the case has been removed from the same pillow the last two nights. Plus, I sleep on my back most of the night which means I have to sit up, turn around, grab the specific pillow, remove its case, and then place it back under my head. What am I doing? It's very strange. Trevor insists he is not involved... but I can't help but imagine him pulling it off and out from under my head really quick - kind of like the trick where you yank the table cloth off without disturbing any of the dishes. We'll see what happens tonight!