begin vs go to sleep

begin

verb
  • To come into existence. 

  • To be in the first stage of some situation 

  • To start, to initiate or take the first step into something. 

noun
  • Beginning; start. 

go to sleep

verb
  • To die. 

  • To be affected by paresthesia; to go numb. 

  • To fall asleep. 

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