> I think Europe has sleeper trains too.
Europe has sleeping boats too: you can go from, say, south east of France to the Baelaric island (like Ibiza) in 12 hours overnight.
I remember as a child using a sleeper ferry to get between Jersey and the British mainland. Politically Jersey is ours (it's not technically part of the UK but it's a crown dependency), but geographically it's basically in France. Seems like these days there is no overnight option but the long slow ferry from up the coast does take like half a day to get there and you can book a room so you can get some sleep.
I've taken the ferry from southern Italy(bari) to Croatia and back multiple times. It's a great way to travel. There's a camaraderie on a boat you just don't get on an airplane. Also helps that I can bring my car with me!
The Baltic has a bunch of overnight ferry routes too. Most of them are not very luxurious, but its a nice way to get both travel and sleep done in one go.
Yeah - I regularly go to Corsica from Italy or France, overnight. It's nice when you have to drive several hours to the port, but if I lived near the port, I would definitely go for day travel — it's much faster and way cheaper.