An interesting article I read the other day in Popular Mechanics got a friend of mine in a bit of a tizz. He's an ear nose and throat surgeon, the article was about yawning and how this could be related to brain cooling and of course he had a lot to say about it.
Well quite frankly I'm not a surgeon nor do I know anything about where blood vessels go to and why, but I can't imagine how praying can cause my brain to over heat as the article, by inference, claims.
From what I can read in another article about yawning by Jennifer Viegas, http://dsc.discovery.com/news/2008/12/15/yawn-brain-head-02.html, heating of the brain can be indicative of other maladies such as Multiple Sclerosis and epilepsy. Maybe when your brain is too hot you could experience difficulty focussing and your mind wanders, necessitating refocussing over and over again and having to yawn each time in order to do that.
Well as I have said, I'm not an expert in scientific research into this but I can still think for myself and maintain, Yawning has something to do with spiritual perception or at least where you were thinking about at the time just prior to yawning.
I'm almost sure I will get a few comments from the scientific community with regards to this post. Welcome to Geoff's blog and his bizarre way of looking at life. You may not be able to prove the existence of God Scientifically but He can sure prove you exist, no problem.
Go down on your knees in a private place and focus on God and where He is, talk to him, and I'm almost certain you will yawn. Have fun and may God bless your research into His amazing creation, Geoff.