Objective: This study aimed to clarify differences in assessment of sleep bruxism (SB) using electromyography (EMG) among analysis periods with/without excluding time zones after going to bed (GB) and before getting up (GU).
Methods: Masseteric EMG of 22 outpatients clinically diagnosed as SB was measured. Sleep onset (SO) and waking up (WU) were determined using a wearable motion monitor. Numbers of EMG episodes for nine periods were scored: GB-GU, SO-WU and other seven periods with exclusion of 15 min or more.
Results: Number of episodes/h for SO-WU highly correlated with those for the other eight analysis periods. The number for GB-GU was significantly larger than that for SO-WU, whereas those for other seven analysis periods were not significantly different from that for SO-WU.
Conclusion: The results suggest efficacy of excluding some adequate time zones after GB and before GU with a possibility of wakefulness in SB assessment.
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