At the house I lived at b4 I moved to Vegas, I would wake up in the night because my bed would shake violently. I dont know what caused this but it scared the @#$% out of me. One night that happened I went down stairs to get a glass of water. AS I entered the kitchen I saw a pair of what I thought to be red eyes. I of course didnt stay down there long enough to see what is was. I was up the rest of the night and I never went down stairs after dark again. The bed shakes continued untill the day I moved away.