oscitancy

Noun

• an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom
  • he could not suppress a yawn
    
  • the yawning in the audience told him it was time to stop
    
  • he apologized for his oscitancy
    

• drowsiness and dullness manifested by yawning

Related words

• Synonyms: 
  yawn , yawning , oscitance