Bruxism bruxism), but also possibly grinding, and is often associated with other semivoluntary oral habits such as cheek biting, nail biting, chewing on a pen or pencil absent mindedly, or tongue thrusting (where the tongue is pushed against the front teeth forcefully). There is evidence that sleep bruxism is caused by mechanisms related to the central nervous system, involving sleep arousal and neurotransmitter abnormalities. Underlying these factors may be psychosocial factors including daytime stress which is disrupting peaceful sleep. Sleep bruxism is mainly characterized by "rhythmic masticatory muscle activity" (RMMA) at a frequency of about once per second, and also with
The Grinding Wheel has received generally positive reviews from critics. Blabbermouth.net writer Ray Van Horn Jr. gave the album a rating of nine-and-a-half out of ten, and said, "If you think Overkill expended its tanks producing output with such astonishing velocity, you don't know this band very well. For its eighteenth album, "The Grinding Wheel", Overkill does the unthinkable: it outdoes itself. Consider that some fans dropped off after 1991's "Horrorscope", which is those poor saps' folly. For the diehard wrecking crew, "The Grinding Wheel" is going to be a gift to cling to throughout 2017." He finished his review, saying that the