I used a few in France a decade ago when they still had bunk beds (right now I think they don't have bunks anymore). It was nice if you wanted to arrive very ea

I used a few in France a decade ago when they still had bunk beds (right now I think they don't have bunks anymore). It was nice if you wanted to arrive very early and tired (never could sleep well). But now, with the increased number of fast train lines, I don't really see the point when travelling in France.