Shaking

Okay, I think we just had an earthquake.  I'm sitting in my bed (there aren't any chairs in the room) and the bed starts shaking.  Since I'm the only one in it - it's not me causing the shaking.  As I'm about to blame the new person who just arrived three doors down, I realize "Hey, that's not possible".  I sit, feel and watch the bed shake, wondering if I should run outside or just stay still.  It's kind of strange - because you expect earthquakes to be accompanied by noise.  Which I'm sure they are closer to the source.  This was just shaking without the noise - for maybe 45 seconds.  It's over, we're fine.