SAD

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Symptoms: If you have seasonal affective disorder (SAD), you will usually develop symptoms of depression during the winter when there is less daylight (October through April). Symptoms of SAD include:
Difficulty concentrating. Low energy and fatigue. Reduced interest in daily activities, especially social activities. Moodiness (depressed, sad, or unusually quiet). Increased appetite. Cravings for complex carbohydrate (such as pasta and bread). Weight gain. Increased sleep. Loss of interest in sex. Irritability. People with SAD may either have symptoms of major depression or minor depression. Those with minor depression are considered to have subsyndromal SAD.
1 http://health.yahoo.com/depression-overview/seasonal-affective-disorder-sad-topic-overview/healthwise--hw169555.html

What is seasonal affective disorder (SAD)?
Seasonal affective disorder, or SAD, is a type of depression that affects a person during the same season each year. If you get depressed in the winter but feel much better in spring and summer, you may have SAD.
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