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
Grinding (gaming) in-game aspect which requires the player to engage in grinding. Grinding has led to some players programming scripts, bots, macros and other automation tools to perform the repetitive tasks. This is usually considered a form of hacking or an exploit by the game's developers, and will often times resort in a ban. Due to the controversial subject of grinding, this act is sometimes, but not always, frowned upon in the gaming community. Several answers have been suggested for the question of why players grind. A major motivating factor is the players' desire to pursue what appears to be the game's