| http://www.w3.org/ns/prov#value | - Melatonin is a sleep-related hormone that may cause symptoms of depression.What are the symptoms?Common symptoms of SAD include: * Symptoms of depression, such as fatigue, low self-esteem, loss of interest in normal activities and withdrawal from family and friends * Weight gain and cravings for carbohydrates, especially sweets and starchy foods * Oversleeping or trouble waking up in the morningA
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