Sometimes I find myself yawning when people yawn. Why is that? Why do people yawn when tired? After reading this you will probably yawn at least once. Please let us know if you did and/or provide your input on yawning.
It's the body mechanism to vent out the excessive carbon di oxide accumulated in the lungs and to inhale more of the oxygen in the lungs. It signifies lack of interest in the subject under consideration and the fatigues of the brain which demand more oxygen, so people yawn.