Glad I wasn't the only one who thought it was a spasm of some sort. I was on my bed watching a DVD and I had my head resting on my arm when I felt a slight vibration. I briefly considered a quake, but as I often watch TV in this position and end up with pins and needles and such like, I just shook the 'spasm' out of my arm and changed my position! I remember the one in 2002 which felt stronger where I live than this one did. That one woke me up, but I quickly dismissed it for dad tripping over his own feet en route from bed to bathroom... I keep missing the big picture!