[Frapiscide]

First off, I'm not exactly sure where to put this.
 
Now, I'm not sure why, but whenever I listen to music, I tend to yawn a lot more than I normally do.  I usually yawn one to two times per song.  Is there an explanation to this and is there any way I can prevent it, because it gets annoying after a while.  
Is it because the sound waves exert a small amount of pressure on the ear drums and the body automatically tries to equalize the pressure from yawning?

 

[NA Blur]

Perhaps it is as simple as you tend to listen to music when you are sitting down.  Your heart rate slows and thus your blood pressure lessens.  If my hypothesis is correct you should not yawn nearly as much standing up or to an extreme while exercising.

 

[obobskivich]

My understanding is that we yawn either because of the social implications (which I don't understand) or because we need to rapidly exchange CO2. So sitting around might prompt that. But here's more depth:
http://en.wikipedia.org/wiki/Yawn

Personally I don't seem to yawn much (if at all) while wearing headphones. But that doesn't really tell us anything - we now have a sample size of two.

 

[Joe Bloggs]

I do one better than you: whenever I listen to a few subbass heavy songs (especially if the subbass has been EQed up) on my Philips SHE3580, I feel this overwhelming need to sleep about an hour later. I reckon it's the first signs of concussion