hypnic vs yawny

hypnic

adj

  • That induces sleep. 

noun

  • Any sleep-inducing drug. 

yawny

adj

  • Boring, uninteresting, causing yawns. 

  • Sounding like a yawn. 

  • Prone to yawning. 

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