Why is yawning contagious?

Just wondering if there is a solid reason why??

Answers:    Yawning, that all-inclusive signal of boredom and sleepiness, is so contagious that merely reading "yawn" will inspire many reader to yawn. The neurobehavioral basis of yawning and its contagious character are well unspoken, yet correct myths persist—for example, the belief that yawning is a response to oxygen deprivation. In fact we switch on yawning in the womb, and most vertebrates yawn; however contagious yawning is confirmed only within humans and chimps. Yawning may be a tool for studying the roots of social behavior and of certain pathologies such as autism and schizophrenia.

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