Stranger on the 3rd Floor says,
Here’s what [German] Wikipedia has to say about Reinert’s depiction of a “nervous epidemic” sweeping the nation ...:Cambridge closes by saying, "Robert Reinert's largely unknown Nerven is notable for its role in recording the frenzy of illness following the First World War."
“Nerven opened in Munich in 1919. People were hospitalized after watching the movie and one woman, after seeing it, woke up one night, went out on the street in her nightshirt and screamed ‘Now I am going to die! Now I am going to die!’ About Nerven, one recent critic wrote ‘Nerven is a disorienting, highly experimental work. Released in 1919, before The Cabinet of Dr. Caligari (early 1920), it might have become a prototype of German Expressionist cinema if it had been widely seen.’