Sleep tight

Sleeping on the train is an exercise in efficiency. If you're in a coach seat, you figure out how to fold into the seat, curling against the window or trying not to spill out in the aisle.
Or, you book a sleeper; a beehive of tiny rooms, each making the most of every available inch of space. On the Empire Builder Superliner sleeping car the "large" bedroom features a fold-out upper bed, a sofa which opens to become a somewhat-wider lower bed.
There's a tiny basin and a really tiny toilet which doubles as a shower.
Small? Yes. Fun? You bet. Comfortable? Surprisingly so.
Best thing of all? The soft knock-on-the-door wakeup call. I'd trade my alarm clock for that any day.