National Sleep Foundation

Chapter 7: Sleep-Related Movement Disorders

Sleep-Related Bruxism (SB)

Sleep-Related Bruxism (SB) is characterized by grinding and/or clenching the teeth during sleep, and is usually associated with sleep arousals.69 The grinding sound often disturbs bed partners, and is a frequent prompt for an individual seeking medical attention. It is different from teeth clenching or gnashing that occurs when the person is awake.

References 

69 Lavigne GJ, Manzini C, Huynh NT, “Sleep Bruxism,” in Kryger M, Roth T, Dement W (ed.), Principles and Practice of Sleep Medicine (5th Edition), St. Louis: Elsevier Saunders, 2011, pages 1128 - 1139.