The international Trenhotel services from Paris to Madrid and Barcelona were sadly withdrawn in December 2013. Renfe still describes the domestic trenhotel services such as Barcelona - Granada, as does EUrail but I can't find this train in the Renfe online timetable and rail.cc claims it is withdrawn, which would make it somewhat odd that Renfe still advertises for it. Does this night train still exist?
Yes domestic tren hotel services are still running.
Also renfe have recent started investing in new carriages for these services,
Just to make sure my info was correct I did a time table search on one of the routes and came up with this