nappy vs sound asleep

nappy

adj
  • Inclined to sleep; sleepy. 

  • Having a nap (of cloth etc.); downy; shaggy. 

  • Nervous, excitable. 

  • brittle 

  • Foamy; having a large head. 

  • Of hair: tightly curled or twisted; frizzy (often specifically in reference to Afro textured hair) 

verb
  • To put a nappy on. 

noun
  • An absorbent garment worn by a baby who does not yet have voluntary control of their bladder and bowels or by someone who is incontinent; a diaper. 

  • A shallow, flat-bottomed earthenware or glass bowl with sloping sides. 

sound asleep

adj
  • Sleeping still and silently. 

How often have the words nappy and sound asleep occurred in a corpus of books? (source: Google Ngram Viewer )