ride a train in a sleeper car

I rode a sleeper car from Tokyo to Nagasaki with what was soon to be my wife (and soon after that to be my exwife). We had our own cabin (or whatever you call them on trains). When it got dark, a train dude came in to covert our space into two pulldown beds. They are quite narrow and not legal (for safety reasons) for two people to sleep in one bed. We broke the law. The rocking and the bumping felt really nice. I think the train was doing that too.