Paris – Germany Night trains operate between Paris and the German cities of Hanover, Bremen, Hamburg, Munich, Frankfurt and Berlin.

Routes and travel times:

Paris – Hannover 9 hours
Paris – Berlin 11 hours 10 min.
Paris – Bremen 9 hours 30 min.
Paris – Hamburg 10 hours 45 min.

Deluxe Sleepers:
Single (Class of Service S) 1 berth cabin (1st cl.)
Double (Class of Service T) 2 berth cabin (1st cl.)
T3 (Class of Service U) 3 berth cabin (2nd cl.)

More info here and here