There currently are a variety of options to travel by night train from Ötztal (Austria) to Bremen (Germany), taking between approximately 12 and 14 hours: Namely the UEX 1300, the UEX 1302, the UEX 1306 and the UEX 1308. These lines are operated by UEX.
UEX (Urlaubs-Express) operates seasonal night trains, including car-carrying trains (Autoreisezüge), from Germany to Austria and back.
You can choose a seat, a couchette berth, a whole couchette compartment, a private sleeper compartment or connected sleeper cabins.
Cars can be taken on the train at the car terminals only, and the vehicle is booked together with the ticket.
There is a free ski compartment. Drinks and snacks are available in the bistro on board.
There is a reduced fare for children who have their own seat or bed.