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REVIEW ARTICLE
J Korean Sleep Res Soc. 2005;2(1):33-38.         doi: https://doi.org/10.13078/jksrs.05006
Light therapy in circadian rhythm sleep Disorders
Eun Yeon Joo, and Seung Bong Hong
Department of Neurology, Samsung Medical Center, SBRI, Sungkyunkwan University School of Medicine, Seoul
Corresponding Author: Eun Yeon Joo ,Tel: +82-2-3410-1535, Fax: +82-2-3410-0052, Email: jey1220@freechal.com
Received: 7 June 2005;  Accepted: 16 June 2005.
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ABSTRACT
Delayed and advanced sleep phase disorders, shift worker, and jet lag have been treated successfully by appropriately timed artificial bright light therapy. Under entrainment to the 24-hour day-night cycle, the sleep-wake pattern may assume various phase relationships to the circadian pacemaker by abnormally long or short intervals between the dim light melatonin onset (DLMO) or the core body temperature (peak time) and wake-up time. Delayed and advanced sleep phase disorders may be associated with shifted circadian rhythms (body clock). Those with “weak” circadian rhythms need a very bright stimulus of light to reset their body clock every day. Underlying circadian phases as well as psychosocial environments influence the timing of sleep. Exposure to light early or late in the subjective night has been used therapeutically to produce corrective phase delays or advances, respectively in both the sleep pattern and circadian rhythms. Bright light (10,000 lux intensity) has been found to be the effective means of shifting circadian rhythms. This article introduces how bright light can re-shift delayed or advanced circadian rhythms to their normal pattern and protocol of light therapy in shift work and jet lag.
Keywords: Circadian rhythm | Bright light therapy | Shift work | jet lag
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