It's funny because my youngest woke up twice in the night (very unusual for him) and I was up far earlier than normal. I'd just logged on to the computer, having given up any idea of getting back to sleep, when the old house we rent basically shivered. Really no other way to describe it....it was like a long shiver shook the house. I thought at first I was imagining it but I touched the wall beside my computer desk and you could just feel the house vibrating slightly.