Again, I have updated the map showing the long-distance night trains in Germany for the year 2023. You can find the older version here.
There have been a couple of changes. ÖBB rearranged their Nightjet trains from Zurich to Germany. The train to Hamburg is no longer combined with the Nightjet to Berlin. Instead, its route has been slightly changed, so that also Heidelberg, Darmstadt and Bremen are served by a night train. The train to Berlin now runs via Erfurt, Leipzig and Halle instead of Braunschweig, Magdeburg and Brandenburg. Between Zurich and Leipzig, the train is combined with the new daily trains from Zurich to Leipzig-Dresden-Prague operated by ČD. In addition, one of the Nightjet trains starting in Munich is extended to Stuttgart.
The rather newly introduced night train service Alpen-Sylt-Nachtexpress has been ended. It is still unclear, when the new operator European Sleeper will start to connect Brussels, Amsterdam with Berlin and Prague. Already since September 2021, the Swedish railway company SJ has operated night trains from Hamburg-Altona to Stockholm, which is now shown on the map as well.
I made an effort on analysing the timetables carefully. However, if you discover any mistake in the maps, please let me know. Just be aware that I had to make numerous simplifications because the routes and stops vary strongly. Please always refer to the current timetables.
lars' transport maps 
it this orrect “ÖBB rearranged their Nightjet trains from Zurich to Germany. ” – or should it be SSB?
Thanks for really valuable stuff!
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Well, the Nightjet trains in genereal as well the ones from Zurich to Berlin, Hamburg and Cologne-Amsterdam are run by ÖBB. So the sentence is correct in my point of view. However, as far as I know, there is a cooperation with DB, SBB and NS (only the one to Amsterdam) somehow.
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