There currently are a variety of options to travel by night train from Jenbach (Austria) to Bremen (Germany), taking between approximately 11 and 13 hours: Namely the UEX 1300, the UEX 1302, the UEX 1306 and the UEX 1308. These lines are operated by UEX.
UEX (Urlaubs-Express) runs seasonal night trains and car-carrying trains between Germany and Austria.
Options range from seats and shared couchettes to private couchette compartments, sleeper compartments and 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.
Children with their own seat or bed pay a reduced fare.