I certainly wouldn't say "regularly" - rarely might be a better word. Sometimes it makes sense to crash at a capsule hotel if the trains are closed for the nigh

I certainly wouldn't say "regularly" - rarely might be a better word. Sometimes it makes sense to crash at a capsule hotel if the trains are closed for the night or something, but that's not common for most (or many) people. Nowadays the capsule hotels cater more towards tourists than their original market anyways.