The only night trains I've travelled on were from Bratislava to Warsaw about ten years ago, which was quick enough, cheap but not particularly restful because, although the cabin was comfortable, the frequent border crossings and associated loco changes with bumpings and clangings and passport inspections ^ this was before those countries joined the
EU» ^ made too many interruptions; and in the Soviet Union, so long ago that it still was that. Those cabins were comfy and roomy, probably because Russian trains are wider (and perhaps taller?). Also, each carriage had its
dejurnaya who brought us glasses of tea.
But when I was working in Poland (early 2000s) I used to travel back to Britain either on a plane or in a long-distance bus, depending on how much money I had at the time! The train was more expensive than a full-service flight and took longer than the bus, because of having to change (Berlin, Cologne, Brussels,
IIRC▸ ). Nowadays, cheap flights must have taken most of the bus passengers, but they still survive, partly I think due to their much larger baggage allowances.