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Seasonal Affective Disorder and Circadian Rhythms

Explain why people in Washington State are often affected with Seasonal affective disorder in the winter using general knowledge of circadian rhythms. And, explain how can Seasonal Affected Disorder can be treated.

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People in Washington State are often affected by "Seasonal Affective Disorder," especially in the winter months, since Washington State is one of the rainiest and least sunny areas in the country. Sunlight has been negatively correlated with Seasonal Affective Disorder (SAD). That means that there is less SAD reported during the months that more sunshine is available and in the areas where more sunlight is available in general.

This seems to be related to melatonin ...

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