What´s Seasonal Affective Disorder?

Seasonal Affective Disorder, is a condition that affects the emotional wellbeing of a person through the longer, darker months of the year, usually around October to March. It leaves them is a depressive state and they can actually feel sad. Unable to function at 100%. they have less resilience to stress and so may develop depression or relationship problems.
Reduced levels of sunlight in the darker months, leads to a drop in the amount of vitamin D produced by the body. Vitamin D is needed to produce chemicals in the body that interact with mood levels.