your tension maybe...

(have to give the little monkey a break every now and then..you know, throw him a banana)
what are you doing with your mouth to make it so tired...
.....Nothing that your potty mind could come up with. I use to grind my teeth at night when I was a child (and I was such a precious child...Mike_s has some awesome photos of me) but I digress, after wearing braces it fixed my jaw for the most part until I started diving and having to bite down on the mouthpiece for extended periods of time.