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group had an overall reduction in time spent awake through the night, increase in total sleep time, and reported waking later in the morning compared to the control group. Finally, the BLT group reported fewer symptoms of depression at 4-week follow up (Lack, Wright, Kemp, & Gibbon, 2005). Overall, these findings offer support for brief courses of BLT as an effective treatment for dysregulated circadian rhythms, as well as mood. Because circadian rhythms are malleable and will synchronize to changed cues, for example to a new light/dark cycle when travel across time zones occurs (Vitaterna et al., 2001), it is possible that eating behaviors can shift with the use of BLT. Seasonal Affective Disorder: A BLT Model Bright light therapy has been used in the treatment of many psychological conditions such as seasonal affective disorder (SAD). In fact, it is the gold standard treatment for persons with SAD (Pail et al., 2011). When a person receives bright light therapy they are typically seated closely in front of a light therapy box that simulates natural outdoor light. The individual is encouraged to keep their eyes open but not to look directly in to the lights. The head and body must be oriented toward the light box. A person may engage in normal activities, such as reading, as long as they are oriented toward the light. The frequency, intensity, and duration of use vary depending on symptom severity and recommendations from the prescribing treatment provider. BLT is similar to natural light and has an effect that indoor light cannot produce. A significant advantage of BLT is there seem to be virtually no adverse side effects. There is evidence that BLT can have rapid effects for SAD. Reeves and colleagues (2012) were interested in rapid effects of bright light therapy in people suffering with seasonal affective disorder (SAD). These authors used a placebo-controlled crossover design where participants received 1-hour of light therapy and 1-hour of dim red light therapy. They measured 23PDF Image | BRIGHT LIGHT THERAPY FOR late NIGHT EATING SYNDRome
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