this is probably the most unconscious thing that all vertebrates do. yawning is an occurrence that has baffled many scientific minds for ages and the end is not in sight. for what is most tangible fact, yawning is brought about by nervous stimulation that causes the jaw muscles to relax opening the mouth wide, stretching out of the eardrums and closing of the eyes.
there are several causes of yawning; boredom, hunger, sleepiness, fatigue. and funny enough, yawning can also be induced by watching someone else yawn as well. take keen interest when someone next to you yawns, you would most likely follow suit. its practically infectious, just like happiness, sadness, smiles and laughter.
in medical sense, yawning does not in any way contribute to your health. its a factor yet to be clearly panned out, but till then, everyone just yawn away...
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