Popular routes, especially those with private sleeper cabins, sell out weeks in advance.
Every line is different. Some provide full breakfast and showers, while others are more basic "couchettes" with shared facilities.
There is something inherently cinematic about a train station after dark. While the rest of the world retreats into sleep, a small community of travelers gathers under the glow of departure boards, waiting to disappear into the night and wake up in a different world.