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Updated 02 March 2016

Light therapy for depression

If lack of sunlight contributes to seasonal affective disorder, then getting more light may reverse it. Bright light works by stimulating cells in the retina that connect to the hypothalamus, a part of the brain that helps control circadian rhythms. Activating the hypothalamus at a certain time every day can restore a normal circadian rhythm and thus banish seasonal symptoms. Light therapy entails sitting close to a special “light box” for 30 minutes a day, usually as soon after waking up as possible. These boxes provide 10,000 lux (“lux” is a measure of light intensity). That’s about 100 times brighter than usual indoor lighting; a bright sunny day is 50,000 lux or more. You need to have your eyes open, but don’t look at the light.

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