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studies showed promising results, and suggest that light therapy, which specifically targets circadian rhythms, may be a useful intervention. Why Bright Light Therapy (BLT) is a Promising Intervention for NES Although the exact mechanisms of change associated with BLT are largely unknown, BLT has been shown to be helpful with many conditions believed to be caused by dysregulated circadian rhythms (Quera Salva et al., 2011). Bright light therapy is believed to target behavioral and biological markers of circadian rhythm such as body temperature, melatonin, and sleep. When an individual receives BLT, it is hypothesized that their circadian rhythm shifts either ahead or back depending on what time of day the light is presented. With this shift, individuals are thought to experience symptom relief because circadian rhythms are re-entrained to mimic normal patterns and in turn, decrease symptoms (Pawlow, 2012). There is evidence that even brief exposure to BLT is effective in effective in shifting both behavioral and biological indicators of circadian rhythm. Lack and colleagues (2005) examined behavioral and biological markers of circadian rhythm shifts using brief exposure to bright light therapy in individuals with early morning awakening insomnia. Participants were twenty-four healthy adults with early waking insomnia who were either assigned to receive 2,500-lux white light therapy for 2 evenings or to a dim-red light control group. In order to monitor behavioral effects of BLT, mood scales, sleep diaries, and activity monitors were used before BLT and for 4-weeks during follow-up. For biological markers, rectal temperature and urinary melatonin rhythms were assessed prior to treatment and after 2 sessions of BLT. Results indicated no changes in circadian rhythms shifts in the control group but the BLT group demonstrated 2-hour phase delays of circadian melatonin rhythm and temperature. Furthermore, after the 4-week follow up the BLT 22PDF Image | BRIGHT LIGHT THERAPY FOR late NIGHT EATING SYNDRome
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