madness vs midsummer madness

madness

noun
  • The state of being mad; insanity; mental disease. 

  • rash folly 

  • The state of being angry. 

midsummer madness

noun
  • Madness attributable to the heat of summer, or to the midsummer moon. 

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