night after night vs nightly

night after night

nightly

noun
  • A build of a software program with the latest changes, released every night. 

adj
  • Happening or appearing in the night; night-time; nocturnal. 

  • Performing, occurring, or taking place every night. 

  • Used in the night. 

adv
  • Every night. 

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