I did manage to wait until about 5:10 (when my early alarm went off) to turn on the TV and confirm that there was a 5.2 earthquake in southeastern Illinois, that was felt all over the Chicago area. Tara reported that she was going down stairs and briefly thought it was the return of a vertigo problem she's had of and on since some surgery a couple of years ago. The cat, dog and kid seemed to be unaffected.
A few minutes ago I felt some more shaking and noticed that my monitor was moving. I just did a refresh on the USGS website and it brought up a 4.5 quake north and a bit east of the original quake at 10:14:16 -- about the time I felt it. I suspect that this is what I felt.