Overnight sleeper ferries are a thing in China, I took one from Shanghai to an island in zhejiang once.
If you take a ferry up from Washington state to Alaska, they have sleeper cabins of course for the rich but you are also allowed to pitch a tent on top in a designated area.
If you take a ferry up from Washington state to Alaska, they have sleeper cabins of course for the rich but you are also allowed to pitch a tent on top in a designated area.