Recommendations for daytime, evening, and nighttime exposure to indoor light for optimal support of physiology, sleep, and alertness.
Inappropriate light is associated with mental disorders, confirmed by a large-scale study of light, sleep, physical activity, and mental health in more than 85,000 people. Circadian rhythm disruptions are behind many psychiatric disorders. Exposure to inappropriate light therefore represents an environmental risk factor for susceptibility to psychiatric disorders. Seeking light during the day and avoiding light at night can be a simple and effective non-pharmacological means to overall improve mental health.
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