nervous breakdown vs nightmare

nervous breakdown

noun
  • A psychological disorder usually characterized by panic attacks and aggressiveness, related to the Hispanic ataque de nervios. 

  • An attack of a psychological disorder such as depression or anxiety so severe that it prevents a person from continuing to function normally 

nightmare

noun
  • Any bad, miserable, difficult or terrifying situation or experience that arouses anxiety, terror, agony or great displeasure. 

  • A very bad or frightening dream. 

  • A feeling of extreme anxiety or suffocation experienced during sleep; Sleep paralysis. 

verb
  • To have a nightmare. 

How often have the words nervous breakdown and nightmare occurred in a corpus of books? (source: Google Ngram Viewer )