I love night trains. I’ve taken them from Warsaw to Prague, Prague to Zurich, and Verona to Paris. It’s by far my preferred option - you get a decent nights sleep and whilst the tickets are more expensive it’s one fewer nights in a hotel which normally offsets it. I still really want to do the two in the UK, the Caledonian Sleeper and the Night Riviera.
I envy anyone who can catch more than 2-3 hours of sleep on a night train.