Have you considered long distance buses from something like Flixbus? I live in Rotterdam and see them coming into the central station from all over Europe.
Any travel by Flixbus longer than 6 - 8h is really painful imho, they are not really long-distance bus. They are nice for cheap big city hopping. Of course a lot of people do use them for longer trips but honestly, I don't know anyone that arrive from a long distance bus rested tbh also.
I'm Czech. When I lived in Amsterdam, my sister came to visit by Flixbus. She's used to all kinds of travel, but boy was she destroyed by that journey...
Some people can sleep on such buses. I for sure can't. So I always prefer to go by bus over daytime (wasting a day) instead of the night (ruining both the night and the next day).