A Case of Involuntary Rhythmic and Characteristic Tapping Sounds during Sleep

Involuntary motor disorders during sleep, such as sleep bruxism (SB) or facio-mandibular myoclonus (FMM), are observed in the oromandibuar area. This feature is repetitive and rhythmic movement produced by short muscle contraction. We report here a case of involuntary repetitive and unusual tapping sounds. The repetitive periodic jaw movement was observed every night but was absent during waking hours. The unusual sounds were confirmed both by audio recorder and the patient's bed partner.Video PSG showed spontaneous myoclonic EMG activity associated with lip movements and characteristic sounds from the patient's mouth.

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