I took an overnight train from Munich to Essen (~8hrs), and it was not fun at all. No beds, full on bright lights, people are noisy, they constantly check your

I took an overnight train from Munich to Essen (~8hrs), and it was not fun at all. No beds, full on bright lights, people are noisy, they constantly check your ticket after staff changes, and that was an ICE which is much nicer. With the 49 Euro, you're going to have to transfer more, so you have all that working against you. You would not get much sleep, even if it were legal to use it like a hotel. They were pretty good about kicking off shady people that were clearly high or something, had no ticket, and were using it as a shelter.