Question: What goes on in this house while I slumber?
Hypothesis: My sleep is profoundly messed up.
Prediction: Something weird is happening at night.
Test: When I went to bed, I had a pillow under my head, I was covered by a single blanket, and I have a second blanket wadded up and stuffed under my feet to elevate my legs. When I awoke, the blanket that was my original source of warmth had been rolled into a ball and replaced the pillow. The blanket that was propping up my feet was pulled over the top of me and in it's place was a pillow. But not the pillow I first laid my head on - that pillow was nowhere to be found. I have no memory of how this rearrangement occurred.
Analysis: I need better sleep habits.