snooze vs zonk out

snooze

verb
  • To sleep, especially briefly; to nap, doze. 

  • To pause; to postpone for a short while. 

noun
  • Something boring. 

  • The snooze button on an alarm clock. 

  • A brief period of sleep; a nap. 

zonk out

verb
  • To fall suddenly into a very deep sleep. 

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