The Sleeper Bus in China
In the West, the Sleeper bus is more commonly used for touring musicians and their entourage to cross country for their shows.
In CHINA, the sleeper bus is a common public transport to traverse long distances cheaply, when the train is not available as an alternative.
Surprisingly, comfortable for ASIAN sized people,
you can even cross the Kalahari desert in a sleeper bus.
I think this one did. Be prepared to sleep in one for 36 hours though….