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Europeans don't love sleeper trains. A very small subset of us do. The rest of us stay away, because being essentially trapped in a 6 berth room with unknown creeps of any gender, is the opposite of safe travel.
Europeans love travelling by train, but sleepers are used only by a small minority.
Umm, in Finland there are sleeping cabins for 1-3 people and you need to reserve the whole cabin. No randos.
Ok, I guess I should amend it with "... and aren't prepared to pay 5-10x the flight fare to book a full cabin to avoid randos".
Unless you're travelling in a 4-6 person group, the costs are prohibitive. You need to deal with the creeps.
Just checked the prices for a round trip a while ago to Vienna from Amsterdam by train (Nightjet, full cabin booked) and by plane with KLM for 2 people. Prices were very similar.