When you wake up in the morning feeling some sore in your jaw, teeth and with a headache, you may be grinding your teeth while you sleep. Teeth grinding is an unusual habit of clenching your teeth, especially during sleep. It is an involuntary action of gritting, tightening, clenching, or grinding your teeth. This habit is called bruxism.
Oftentimes, a person would not know that they grind their teeth in their sleep but the partner who shares their bed is often the first to hear grinding sounds and eventually notices the problem. You may also notice a friend who feels nervous about his report to be grinding his teeth.