An extremely large number of people grind, gnash, and/or clench their teeth while sleeping. Many people are unaware that they are doing this. It is sometimes thought that grinding will occur during periods of stress. We believe now that while stress may enhance your periods of grinding, it is not the only cause.
While you are asleep, your teeth will come together about two to four times during seven to eight hours of sleep. When there are irregularities in the chewing surfaces of your teeth, an automatic reflex occurs (by grinding) to eliminate a spot where it is too high. Your neuro-muscular system steps into high gear and extends extreme pressure through the muscles of the mouth and jaw to grind away your teeth in a never ending battle which does nothing but cause aches and pains.