Warum hat Deutschland keinen solchen Nachtzug? Baltic Express Gdynia–Prag

In this video I travel overnight in a PKP Intercity sleeping car from the Polish port city of Gdynia to the Czech capital Prague. The train works like a fascinating hybrid: long-distance IC/EC service in Poland, sleeper train overnight, and a beautiful morning arrival in Prague. I show the departure from Gdynia, the sleeping compartment, onboard comfort, the dining car, the mountain scenery around Międzylesie and the final approach to Prague. Could this concept also work in Germany?