Why this word is great
OSCITANCY — [Noun] The state of drowsy inattention, most characteristically betrayed by yawning. From the Latin ōscitō ("to yawn, gape"), from os ("the mouth"), with the English suffix -ancy forming a noun of state. Unlike "lethargy," which implies a general, enervating sluggishness, or "inattention," which denotes a broader cognitive absence, oscitancy is the precise, contagious lapse of a mind succumbing to sleep's gravity. It is the jaw-cracking surrender during a tedious recitation, the heavy-lidded blurring of print on a page read too late, and the book slipping from slackened fingers—the body’s mute testament to a world insufficiently compelling to keep it awake.