Sleeping on the train was introduce

Sleeping on the train was introduced in 1839,
but it was not until 1865 that Pullman organized the operations
of sleeping cars in a professional organization, separate
from the railways. The travelers could save time and on the
costs of hotels. With Pullman, the standards and comfort
rose. Sleeping cars became part of the tourist experience,
such as the Trans Siberian Railway. The extension of sleeping
cars grew over nearly a century, but declined again with
the expansion of air traffic and the appearance of low-cost
airlines.