Chronic Fatigue Symptom Explained. Chronic Fatigue Syndrome The Centers form 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.” What causes circadian rhythm disorder? Please click on the side index bar for more info. Circadian Light Therapy Resets and Stabilizes the Circadian Clock, (human 'natural body clock), Giving One More Energy. Cannot find the product you are looking for? Please contact us by telephone 0203 303 0543, fax , or email: info@adsshop.co.uk. We can usually source other products and we always welcome suggestions for additional products for our shop.