The slow return of night train services around the world seems to call for a separate thread. This will be for additions and cancellations of service that did not work. Sleeper service especially to be noted.
Here is a Sweden proposed service. Reading between the lines appears that equipment or lack of suitable equipment may be a problem ? Stated that SJ was looking at available night equipment which may mean sleepers ?
https://www.railjournal.com/passenger/main-line/sj-plans-gothenburg-malmo-duved-night-train/
EDIT" Here is the present night train service in sweden.
https://www.sj.se/content/dam/SJ/pdf/Kartor/Nattåg-karta-2019.pdf