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ORIGINAL ARTICLE
J Korean Sleep Res Soc. 2009;6(2):97-103.         doi: https://doi.org/10.13078/jksrs09019
Sleep Perception Can Be Affected By Recent Sleep Time
Jeong-In Cha, Hyung-Min Kwon, Sanghyung Lee, and Hyunwoo Nam
1Department of Neurology, Seoul National University Hospital, Seoul, Korea
2Departments of Neurology, Boramae Hospital, Seoul National University, Seoul, Korea
3Departments of Neurosurgery, Boramae Hospital, Seoul National University, Seoul, Korea
Received: 11 December 2009;  Accepted: 25 December 2009.
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ABSTRACT
Background: Paradoxical insomnia is a disorder where complaints of insomnia occur without an objective evidence of sleep disturbance. It is presumed to be related to the disordered sleep perception. So far, two factors are regarded to be associated with to the sleep perception. One is the sleep stage and the other is the presence or absence of insomnia. We performed this study to find out factors affecting sleep perception and to confirm the significance of insomnia. Method: We performed sleep EEG in 178 subjects. Sleep was maintained 5 minutes after the onset of the stage 2 sleep. We divided them into two groups depending on the difference of subjective and objective sleep time. Then, various aspects of demographic and sleep-related characteristics were compared between the two groups. Factors we analyzed include gender, age, accompanying disease, recent total sleep time, recent sleep latency, presence of insomnia, severity of insomnia, sleepiness scale before and after EEG, sleepiness scale difference, sleep latency during EEG, time of the day of the EEG, time from the last waking-up to the EEG, and the total sleep time during EEG.
Results: Among many parameters, only the average sleep time in the recent 2 weeks is significantly associated with the sleep perception. The shorter it is, the lesser subjects think they slept during the test. Insomnia does not affect the accuracy of sleep perception in our study. Conclusion: Accuracy of sleep perception depends on the actual sleep time in recent days but not on the presence of insomnia.
Keywords: Paradoxical insomnia | Sleep perception | Sleep stage | Insomnia | Sleep time
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