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Correlations between subjective evaluation about own sleep and that of objective evaluation in psychophysiological insomnia


Dr S Miki, Department of Psychiatry, Jikei University of Medicine, Minato-ku, Tokyo 105-8461 Japan. Email:


The dissociation and correlation between objective (actigraph) and subjective (sleep diary, sleep questionnaire) evaluation about one's own sleep in nine psychophysiological insomnia outpatients was investigated. We found that objective TST (total sleep time) and MT (nocturnal moving time) in actigraph correlated with subjective depth of sleep, number of awakening, physical and mood condition on waking, and total point of questionnaire, while objective sleep latency did not correlate with any subjective measurements. For longer TST and lesser MT, a better subjective sleep evaluation was induced. Subjective sleep latency did not correlate with objective sleep latency but it did with objective sleep onset time. Moreover, the number of subjective awakenings did not correlate with the number of objective awakenings, but with it did with objective TST and MT.