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<p>In this study, we examined the accuracy of sleep-wake determination using the widely employed activity monitor, MotionWatch 8 (CamNTech, Fenstanton, UK), by comparing its results with those of the gold standard for sleep measurement, polysomnography (PSG), which was conducted simultaneously. Forty-five healthy individuals participated in the experiment, in which the MotionWatch 8 and PSG were concurrently utilized in a controlled laboratory environment to measure nocturnal sleep. Sleep variables were evaluated using a Bland–Altman plot analysis, and epoch-by-epoch agreement was assessed using accuracy, sensitivity, and specificity measures. The MotionWatch 8 tended to misclassify periods such as pre-sleep onset and nocturnal awakenings, where individuals were in bed but not actually asleep, indicating relatively low precision in sleep-wake determination. Sleep–wake states from PSG and the MotionWatch 8 showed discrepancies, particularly in distinguishing between wakefulness in bed and sleep. The MotionWatch 8 cannot be used as a direct substitute for PSG-defined sleep/wake states; instead, employing its unique features in a complementary manner can provide a more comprehensive view of various aspects of sleep.</p>

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Evaluation of the accuracy of sleep–wake detection by MotionWatch 8 in healthy individuals

  • 期刊论文

  • 发表日期：

    2026年1月27日

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  • Satomi Okabe,
  • Yoko Suzuki,
  • Zhiwei Fan,
  • Like Jiang,
  • Takashi Abe

摘要

In this study, we examined the accuracy of sleep-wake determination using the widely employed activity monitor, MotionWatch 8 (CamNTech, Fenstanton, UK), by comparing its results with those of the gold standard for sleep measurement, polysomnography (PSG), which was conducted simultaneously. Forty-five healthy individuals participated in the experiment, in which the MotionWatch 8 and PSG were concurrently utilized in a controlled laboratory environment to measure nocturnal sleep. Sleep variables were evaluated using a Bland–Altman plot analysis, and epoch-by-epoch agreement was assessed using accuracy, sensitivity, and specificity measures. The MotionWatch 8 tended to misclassify periods such as pre-sleep onset and nocturnal awakenings, where individuals were in bed but not actually asleep, indicating relatively low precision in sleep-wake determination. Sleep–wake states from PSG and the MotionWatch 8 showed discrepancies, particularly in distinguishing between wakefulness in bed and sleep. The MotionWatch 8 cannot be used as a direct substitute for PSG-defined sleep/wake states; instead, employing its unique features in a complementary manner can provide a more comprehensive view of various aspects of sleep.