First Cabin Haneda Terminal 1
Tokyo, Japan
Built inside an airport terminal, which explains almost everything about it. The cabins borrow their vocabulary from aircraft — First Class and Business Class berths, differing chiefly in floor area and bed width — and the whole floor keeps the hushed, carpeted quiet of a lounge.
A cabin is a private compartment rather than a sealed pod: solid walls, a roll-down screen instead of a locking door, a bed, a television, somewhere to put a bag. Bathing is communal, in large shared baths down the corridor, in the ordinary Japanese manner.
People use it for the reason you would expect. An early departure, a late arrival, a connection too long to sit out and too short to justify going into the city.
In brief