I was awakened early this morning by my bed, which was creaking and swaying a little bit. My first groggy thought was "hmm. Must be earthquaking." My second slightly-less-groggy thought was "It's Indiana. They don't get earthquakes. Must be the dryer or something." But it didn't feel like the dryer--it was too strong and the pattern was all wrong. Also, even if the dryer had been inexplicably running at about 5 am, I would have heard it.
Vindication: There was a fairly strong-ish earthquake centered near Evansville early this morning. People reported feeling tremors as far away as Georgia.
See, I'm not losing my mind.