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  The nociceptive trigeminal inhibitory (NTI) splint has been claimed to decrease the electromyographic (EMG) activity of jaw‐closing muscles and relieve symptoms of various types of temporomandibular disorders (TMD) and bruxism. The present study was designed to address the question about EMG‐changes during sleep. Ten patients (age: 23–39 years) with a self‐report of tooth‐grinding during sleep were recruited. Patients were examined at baseline and after each treatment period with the use of the Research Diagnostic Criteria for TMD. A portable EMG‐device was used to record EMG‐activity from the masseter muscle during sleep. The patients received two 2‐week splint treatments in a randomized cross‐over fashion; an NTI splint and a standard flat occlusal splint (OS). EMG data were analysed according to published criteria. Using a 10% of maximum clenching EMG‐activity cut‐off threshold to …