Yawning Question?

Why Do We Yawn After We See Someone Else Yawn?Yawning Question?
Although it is said that yawning is contagious, but the real pretext behind yawns is because any we are fatigued, or our bodies were removal of oxygen at that point of time. :))
There's something im curious about, thats: why do our eyes opening after we yawn? :]
medicine and robustness guarantee correctness , is for informational purposes only suggestion or treatment for any medical conditions.