These behaviors and experiences occur usually while sleeping, and are most often infrequent and mild. They may, however, happen often enough or become so bothersome that medical attention is required. Bruxism Grinding teeth during sleep is a very common occurrence and little evidence suggests that teethgrinding is associated with any significant medical or psychological problems. In severe cases, mouth devices may help prevent or reduce dental injury.
Experts believe the various types of arousal disorders are related and share some characteristics.
Essentially, these arousals occur when a person is in a mixed state of being both asleep and awake or coming from the deepest stage of nondreaming sleep. This means that a person is awake enough to act out complex behaviors but still asleep and not aware or able to remember these actions. These episodes may begin with the person crying and thrashing around in bed. The individual may appear awake, confused and upset, yet resists attempts by others to comfort or console. It is also difficult to awaken a person who is having an episode of parasomnia.