Sorry, hope you were able to stifle the urge

Somehow today the topic of yawning came up during a casual discussion. The word yawn is very much like the "You Can't Lick Your Elbow" statement, seems as soon as you hear either expression, you become actively involved in the very act.

Alright, I can see from your reflection in the monitor that you are becoming bored with my tiring drivel so I'll get to the point.

I'm not sure if yawning satisfies a physical or pyschological need, but cycling does seem to scratch the same itch and drastically reduce the tendency to yawn. Have you noticed a corelation between the amount of cycling you do and the number of times you yawn?