Alaska Northern Lights Information on Seasonal Affective Disorder(SAD) and the North Star 10,000 light box used to treat Seasonal Affective Disorder.
Wikipedia Links
Seasonal Affective Disorder Seasonal affective disorder, or SAD, is an affective, or mood disorder. Most SAD sufferers experience normal mental health throughout most of the year, but experience depressive symptoms in the winter. SAD is rare, if existent at all, in the tropics, but is measurably present at latitudes of 30°N (or S) and higher.