That's what it was!! Jeez. I was trying to get to sleep around 6 AM this morning and all of a sudden my room started to shake. I thought my CDs were going to fall over. I sat up in bed and just waited it out, all wide-eyed.
I've only encountered two earthquakes/tremors. One here in T.O. at lunchtime when I was a little kid, and once in Japan.
~jen