(n.) The act of yawning or gaping.

acedia apathy boredom doziness dullness enervation ennui fatigue heaviness hebetude inanimation indifference jadedness lackadaisicalness languidness languishment languor languorousness lassitude lenitude lentor lethargy lifelessness listlessness oscitancy oscitation pandiculation passivity phlegm satedness sleepiness sloth slothfulness slowness sluggishness somnolence somnolency stretching stupefaction stupor supineness torpidity torpidness torpitude torpor weariness world-weariness yawning