aha moment vs eye-opener

aha moment

noun
  • The moment or instant at which the solution to a problem, or some other significant realization, becomes clear. 

eye-opener

noun
  • Something that provides a sudden insight, or makes something clear that was previously mysterious. 

  • A startling or shocking revelation. 

  • A strong alcoholic beverage, especially one consumed in the morning. 

  • Something that causes the eyes to open, or that opens the eyes. 

  • An attractive woman. 

How often have the words aha moment and eye-opener occurred in a corpus of books? (source: Google Ngram Viewer )