Os·ci·tan·cy n.
  1. The act of gaping or yawning.
  2. Drowsiness; dullness; sluggishness.
     It might proceed from the oscitancy of transcribers.   --Addison.
  ◄ ►
  oscitancy
       n 1: drowsiness and dullness manifested by yawning [syn: oscitance]
       2: 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 ostinancy" [syn:
           yawn, yawning, oscitance]