There currently are a variety of options to travel by night train from Bonn (Germany) to Augsburg (Germany), taking between approximately 5 and 6 hours: Namely the ICE 619, the UEX 1301, the UEX 1303, the UEX 1311 and the UEX 1313. These lines are operated by Deutsche Bahn and UEX.
Deutsche Bahn (DB) exited the actual night train business in 2016. However, it operates around a dozen Intercity and Eurocity trains that run exclusively at night.
These trains only have first and second class seats. The cars remain lit throughout the night and the seats cannot be reclined.
UEX (Urlaubs-Express) runs seasonal night trains and car-carrying trains between Germany and Austria.
You can choose a seat, a couchette berth, a whole couchette compartment, a private sleeper compartment or connected sleeper cabins.
You can bring your car, but only between the car terminals, and you book the vehicle along with your ticket.
Skis travel free in the ski compartment. A bistro on board sells drinks and snacks.
There is a reduced fare for children who have their own seat or bed.