Is Yawning contagious?

Have you ever yawned and the person next to you yawns? That is the stimuli of your feelings at that time, when you see someone yawn you feel the same way or tired but your brain is telling you that you need to yawn and your feeling that way. When you yawn we are bored or tired, we just don't breathe as deeply as we usually do. As this theory goes, our bodies take in less oxygen because our breathing has slowed. Therefore, yawning helps us bring more oxygen into the blood and move more carbon dioxide out of the blood.Yawning, then, would be an involuntary reflex (something we can't really control) to help us control our oxygen and carbon dioxide levels. Sounds good, but other studies have shown that breathing more oxygen does not decrease yawning. Likewise, breathing more carbon dioxide does not increase yawning.