enervation vs narcolepsy

enervation

noun
  • State of being enervated; debility. 

  • Act of enervating; debilitation. 

narcolepsy

noun
  • A disorder characterized by sudden and uncontrollable attacks of deep sleep, often brief, sometimes accompanied by paralysis and hallucinations 

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