awaken vs spark off

awaken

verb
  • To bring into action (something previously dormant); to stimulate. 

  • To cause to become aware. 

  • To call to a sense of sin. 

  • To cause to become awake. 

  • To stop sleeping; awake. 

spark off

verb
  • To initiate something by providing the necessary conditions. 

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