I was asleep and thought the mrs was having a fit or something, then the noise woke us both up. Asking each other, 'Wtf was that?' I checked the dog was okay downstairs and looked outside to see if anything was up (for example, a fireball flying skyward from the local petrol station). After opening a window and hearing loads of alarms going off, but not seeing anything I then went back to bed, saying it must have been an earthquake. It didn't half make things rattle and clank about though! Must have lasted about 10 seconds of continuous rumbling. The last one I felt, I was sat at me pooter and the monitor shook. It wasn't anywhere near as loud as last nights though. That was quite noisy.