go to bed vs refrain

go to bed

verb
  • To lie down to sleep, put oneself in one's bed. 

  • Of a newspaper: to finish being prepared for printing. 

refrain

verb
  • To stop oneself from some action or interference; to abstain. 

  • To abstain from (food or drink). 

noun
  • The chorus or burden of a song repeated at the end of each verse or stanza. 

  • A much repeated comment, complaint, or saying. 

How often have the words go to bed and refrain occurred in a corpus of books? (source: Google Ngram Viewer )