What the?

Last night, as I crawled in to bed after being up with Avery, something strange started happening. The bed started shaking. Stew sat up. He felt it too. We were having an earthquake! Not enough to scare me but definitely a strange feeling. It lasted only about 30 seconds and then it was gone. I'm sure for people in California this is not a big deal. But here in the heart of the midwest this is NOT a normal occurrence. It measured about 5.4 and it's aftershocks hit here around 10:30. Other than that, a pretty normal Spring day in the midwest. Rain, rain and more rain.