The cause of SAD is unknown, but it may be due to decreased sunlight exposure which affects your body’s sleep-wake cycle, or a drop in serotonin and melatonin levels. Ten million Americans suffer from...
The cause of SAD is unknown, but it may be due to decreased sunlight exposure which affects your body’s sleep-wake cycle, or a drop in serotonin and melatonin levels. Ten million Americans suffer from...
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