If you always feel lethargic and depressed during these gloomy winter months, you could be suffering from Seasonal Affective Disorder, or SAD. This depressive condition is caused by the chemical effects of light deprivation on the brain, which in turn alters the melatonin hormone that controls when we wake and sleep. It also seems to cause problems with our feel-good hormone, seratonin, making our moods slump down further. These days we are more aware of SAD, but it wasn’t officially reco...


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