sleeping vs unawakening

sleeping

adj
  • Asleep. 

  • Used for sleep; used to produce sleep. 

noun
  • The state of being asleep, or an instance of this. 

unawakening

adj
  • Not awakening; dormant, asleep. 

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