How to Beat Seasonal Affective Disorder | ThirdAge: "Circadian rhythms are disrupted. Your body's internal biological clock that lets you know when you should sleep and when you should wake up is thrown out of kilter. The resulting sleep disturbances and feelings of disorientation can contribute to depression.
Serotonin and melatonin levels plummet.The supply of two of your brain's most important "happy chemicals" dwindles during the long, dark days of winter. That may trigger symptoms such as anxiety, hopelessness, fatigue, worthlessness, irritability, trouble concentrating, memory lapses, restlessness, and loss of interest or pleasure in activities you typically enjoy."
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