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In North America, SAD prevlance increases with the latitude.

ncbi.nlm.nih.gov

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Serotonin regulates mood and melatonin regulates sleep and mood.

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Light therapy proves to mos successful for many with the winter version

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-affects more than 500,000 people each year
-SAD is  ore common in women than men
-60% - 90% of people who suffer are female

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-medication
-light therapy
-mange stress
-exercise works for some

psychcentral.com

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Why Winter Makes You SAD: Seasonal Affective Disorder Explained

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In 1979, Herb Kern felt depressed during the winter months and helped create a light box which alleviate symptoms. Officially recognized as a mental condition in 1984 and formally described by Norman E. Rosenthal.

sovhealth.com

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-young females
-people who are far from the equator
-those who have a history of depression
psycom.net

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Symptoms generally found in Summer Version

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Symptoms generally found in Summer Version

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-episodes of violence
-weight loss
-appetite loss
-insomnia
-restlessness
-anxiety
evergreendrugrehab.com

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Symptoms normally found in the Winter Version

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Symptoms normally found in the Winter Version

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-heaviness in arms and legs
-frequent oversleeping
-cravings for carbohydrates
-relationship problems

psycom.org

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-depressed mood
-lack of energy
-difficulty concentrating
-changes in sleep and appetite

psycom.org

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Definition of Seasonal Affective Disorder

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Definition of Seasonal Affective Disorder

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A mood disorder characterized by depression that occurs at the same time each year. Allowing there to be a winter version along with a summer version.

Mayoclinic.org