Chronic Fatigue Syndrome
The Centers for Disease Control and Prevention (CDC) has documented that a circadian pattern exists in Chronic Fatigue Syndrome (CFS). Pain, fatigue, mood, social activity, energy, sleep and weight worsened significantly in the Winter. In addition, about half of CFS sufferers also have major depression in the Winter. Because circadian rhythms affect CFS, researchers have found success treating with light therapy, and have commented that, “Light therapy may provide patients with CFS an effective treatment alternative or adjunct to antidepressant drugs.”
Chronic fatigue syndrome and seasonal affective disorder: comorbidity, diagnostic overlap, and implications for treatment
Am J Med
Terman M, Levine SM, Terman JS, Doherty S.
Light therapy may provide patients with CFS an effective treatment alternative or adjunct to antidepressant drugs

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