I experienced earthquake in Japan when I was doing my NRT-LA. It was 7 something in the morning, I was sleeping and suddenly my bed shook so hard that I got a fright thinking that a ghost was shaking my bed!
Then I stood up and calmed down, and I told myself that it should be an earthquake. Luckily after about 6 to 7 seconds it stopped but I could still hear the sound of things shaking. I went back to sleep.