doze vs hit the hay

doze

verb
  • To sleep lightly or briefly; to nap, snooze. 

  • To bulldoze. 

  • To make dull; to stupefy. 

noun
  • A light, short sleep or nap. 

hit the hay

verb
  • To go to bed. 

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