I recently just looked into what Nightmare was up to, I used to listen to them a lot.
Apparently they went on hiatus a few years back when their lead singer was getting vocal chord surgery (which I imagine might be due to his history of smoking and screaming incorrectly - listen to "Nadirecar", he's just blowing out his voice).
They all split up into their own bands, but were supposed to join back up this year. They had a concert planned just a few days ago actually, but I couldn't find any info on it, at least on English google.