I only ask because I heard somewhere that it might be. Especially considering that when I breathe, I don't feel like they're deep enough. Like I need to breathe deeper, but I feel like I can't. Other times, I feel like I can breathe deep just fine. And these deep breaths feel so satisfying. 

Now what does this have to do with yawning? I feel like in order to get these deep breaths, I have to yawn deep enough. But even then, I feel like I can't yawn deep enough to get these deep breaths. Sometimes I can just deep enough to get a deep breath but other times, I can't and it worries me. DAE experience this?