take a nap vs turn in

take a nap

verb
  • To sleep briefly. 

turn in

verb
  • To go to bed; to retire to bed. 

  • To convert a goal using a turning motion of the body. 

  • To relinquish; give up; to tell on someone to the authorities (especially to turn someone in). 

  • To submit something; to give. 

  • To reverse the ends of threads and insert them back into the piece being woven so they do not protrude and eventually unravel. 

How often have the words take a nap and turn in occurred in a corpus of books? (source: Google Ngram Viewer )