The news is confirming there's been an earthquake so I must not be going crazy just yet.
I have no idea how strong the quake was here, but all I do know is it was strong enough to wake me up (and that's not easy to do) at 5:39am this morning. The whole building was shaking and the windows were rattling. It seemed like it lasted at least 20 seconds.
EDIT: Now saying a 5.4 centered in southeastern Illinois around 60 miles away from Evansville, Indiana.