It woke me up. I just felt the bed shaking, and after a few seconds of it I was like "Yep, that's an earthquake." After it stopped I looked at the clock, and then I went back to sleep.
Of course, it's all they're talking about on the news. There's been some damage in the area (mainly in southern Illinois), including bricks falling off of buildings, cracked concrete, and some woman's porch collapsed. Also they say some bricks fell off a building all the way in Louisville.
It was the biggest since 1968, and was reportedly felt from Michigan to Atlanta. Wild. Of course, the big ones we had in 1811-1812 here made churchbells in Boston ring, created a lake, altered the southwest Kentucky/northwest Tennessee border, and made the Mississippi river run backwards for a few hours.
As it is, this area apparently has miniscule earthquakes as often as several times a month which are too small to feel, but that relieve pressure on the faultline, making the occurance of big ones less likely.
But still, we've had at least 3 or 4 of at least a 4.0 magnitude in the last two years. And they say we're due for a 6.0 or greater (90% chance of it) in the next 50 years. So basically, we're all gonna die and the St. Louis arch is gonna tumble into the Mississippi river. Due to the intraplate location, and the type of faultline, quakes here are more strongly felt, and cause more damage for their size than California quakes.