What position to you most often fall asleep in? Depending upon how the weight is distrubuted around your jaw and face, this may be something to take into account.

For me, I have to rest in a position that doesn't place any pressure on my jaw, as I tend to grind or clench my jaw when I sleep.

I haven't been diagnoised with anything, so I am not certain if what I have is what you describe, but all the same, as others have pointed out, talk to your doctor and dentist. They'll know better than any of us.