Sleep bruxism is a disorder related to periodic arousals during sleep

J Dent Res. 1998 Apr;77(4):565-73. doi: 10.1177/00220345980770040901.


There is evidence that sleep bruxism is an arousal-related phenomenon. In non-REM sleep, transient arousals recur at 20- to 40-second intervals and are organized according to a cyclic alternating pattern. Polysomnographic recordings from six subjects (two females and four males) affected by sleep bruxism (patients) and six healthy age-and gender-matched volunteers without complaints about sleep (controls) were analyzed to: (1) compare the sleep structure of bruxers with that of non-complaining subjects; and (2) investigate the relations between bruxism episodes and transient arousals. Patients and controls showed no significant differences in conventional sleep variables, but bruxers showed a significantly higher number of the transient arousals characterized by EEG desynchronization. Bruxism episodes were equally distributed between non-REM and REM sleep, but were more frequent in stages 1 and 2 (p < 0.0001) than in slow-wave sleep. The great majority of bruxism episodes detected in non-REM sleep (88%) were associated with the cyclic alternating pattern and always occurred during a transient arousal. Heart rate during the bruxism episodes (69.3+/-18.2) was significantly higher (p < 0.0001) than that during the pre-bruxing period (58.1+/-15.9). Almost 80% of all bruxism episodes were associated with jerks at the anterior tibial muscles. The framework of the cyclic alternating pattern offers a unified interpretation for sleep bruxism and arousal-related phenomena.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Arousal / physiology*
  • Bruxism / etiology*
  • Case-Control Studies
  • Cortical Synchronization
  • Delta Rhythm
  • Electroencephalography
  • Female
  • Heart Rate / physiology
  • Humans
  • Leg
  • Male
  • Muscle, Skeletal / physiopathology
  • Polysomnography
  • Sleep Stages / physiology*
  • Sleep Wake Disorders / complications*
  • Sleep, REM / physiology
  • Spasm / physiopathology
  • Time Factors