The distances are just too short for night trains in France and Spain. Deutsche Bahn wanted to open up maintenance windows for the track at night, which is suspected to be the reason for killing their (profitable) night trains; Austria took over most of them, but not the north-south routes. Eastern Europe, the entire train system is a mess, night and day trains. Bulgaria's passenger trains are not in good shape, nor are Romania's, and Serbia's are worse. China, with much longer distances, of course has plenty of functional night trains.