burn the candle at both ends vs work oneself into the ground

burn the candle at both ends

verb
  • To waste something in two directions at once. 

  • To sleep late and wake up early; not well-rested. 

  • To work hard night and day. 

work oneself into the ground

How often have the words burn the candle at both ends and work oneself into the ground occurred in a corpus of books? (source: Google Ngram Viewer )