Something Strange about me 5 of 7

I have been known to grind my teeth (sometimes really hard) at night while I sleep. It doesn't happen all the time, but usually when I'm having a nightmare or really bad stress. I really wonder what my teeth are made out of because several people have told me it sounds like I shouldn't have any with the grinding I have done.

BTW- Watching the opening ceremonies right now of the Olympics. They did a pretty good job on these... although I think the 80's american music with the athletes walking in was cool to listen to but didn't fit the moment or the place.