oscitance

Noun
  1. Drowsiness and dullness manifested by yawning (synset 114054153)
  2. An involuntary intake of breath through a wide open mouth;
    Usually triggered by fatigue or boredom (synset 100838954)
    "he could not suppress a yawn"; "the yawning in the audience told him it was time to stop"; "he apologized for his oscitancy"

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