Why do my wife and I recurrently yawn at the exact same time?

Most times that this happens we do not hold any clue that the other is going to yawn.Why do my wife and I recurrently yawn at the exact same time?
Yawning is still something that is a mystery to scientists, but this site explains some theories and possible reason:
http://www.madsci.org/posts/archives/aug...
Some people read out that yawwning is catchy. Actually it is the brains esponse to lack o oxygen. Since you and she are contained by the same room near is the same amount of oxygen. We tend to yawn when bored also, thiis also is a famine of oxygen since we tend to breath shallowly when bored.
Maybe you are really in sync beside eachother. I saw this program saying that inhabitants often yawn first to more dominant those. Maybe you are both equal parts to your relationship both giving and taking the same amounts. My personal feelings is that the body yawns when it needs more oxygen than it is getting, conceivably you need some fresh nouns and both your bodies sense this at the same time.
If you stay married for 40 yrs. you will look alike too!