Swiss Railways train in Zurich Station
On the evening of Thursday 25th May the first European Sleeper left Berlin at 22.56 arriving in Brussels at around 9.30 the next morning. The return service to Berlin then left Brussels at 19.22 on Friday 26th May arriving in Berlin around 7.00 the next morning. This new service, running 3 times a week offers useful connections with the Eurostar service from Brussels to London and can also be joined at Rotterdam & Amsterdam. They hope to extend this service to Dresden and Prague next year.
For further details see: https://www.europeansleeper.eu/en
The launch of the new service got a lot of good publicity including this article in The Guardian: