A sleepin caur or sleeping car or sleeper (eften wagon-lit) is a railwey passenger caur that can accommodate aw its passengers in beds o ane kynd or anither, primarily for the purpose o makin nichttime traivel mair restful. Theodore Tuttle Woodruff wis the American inventor o the sleepin caur.

Caledonian Sleeper at Euston

The first sic cars saw sporadic uise on American railroads in the 1830s. Thay coud be configured for coach seating during the day. Some o the mair luxurious types hae private rooms (fully an solidly enclosed rooms that are nae shared wi strangers).