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ORIGINAL ARTICLE
J Korean Sleep Res Soc. 2005;2(1):47-50.         doi: https://doi.org/10.13078/jksrs.05008
Effects of light therapy on patients with delayed sleep phase syndrome
Dong Joo Yun, Eun Yeon Joo, Sun Jung Han, Su Jung Choi, and Seung Bong Hong
Department of Neurology, Sleep Disorders Clinic, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
Corresponding Author: Seung Bong Hong ,Tel: +82-2-3410-3592, Fax: +82-2-3410-0052, Email: sbhong@smc.samsung.co.kr
Received: 5 June 2005;  Accepted: 14 June 2005.
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ABSTRACT
Background : Light therapy (LT) is a potent tool for the treatment of circadian rhythm sleep disorder. We present the method and treatment effect of LT in patients with delayed sleep phase syndrome (DSPS). Methods : We enrolled 11 patients (M:F=4:7). Eleven of them had DSPS. Two of them who had post-encephalitic epilepsy were dropped out because they showed photosensitive seizures to LT. Thus the remaining 9 patients received LT with a bright light box for consecutive 7-10 days. The patients sit in front of a “light box”, which emits 10,000 lux of full spectrum fluorescent light for the periods of 30-45 minutes daily in the morning right after wake-up. Light was restricted by reducing room light for 1hour before light-off at bedtime. The timing of LT was readjusted everyday to the scheduled wake-up time of each day. Results : By the LT, the average bedtime was advanced from 02:30 a.m. (range; 01:30-5:50 a.m.) to 23:15 p.m. (range; 22:00-23:50 p.m.) and the average wake-up time from 11:30 a.m. (range; 9:20 a.m.-2:30 p.m.) to 7:50 a.m. (range; 7:20-8:30 a.m.). All patients have maintained the readjusted bedtime and wake-up time schedules for 3.8±2.4 months without additional light therapy. No adverse events of LT were observed.
Conclusion : A short-term LT was able to advance a delayed sleep phase and the advancement of sleep phase has been maintained for more than 3 months.
Keywords: Light therapy | Delayed sleep phase syndrome | Circadian rhythm sleep disorder
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