Other
Sada: Symptoms of Sad
This site describes the symptoms of SAD, when they usually begin and end, and the typical onset of SAD.
Other
Alaska Northern Lights: Seasonal Affective Disorder [Pdf]
A great resource for information about SAD. Read about the symptoms, what causes SAD, how it was discovered that light is the key, and the role that melatonin plays in SAD. Also given are some tips for avoiding the "winter blues".
American Academy of Family Physicians
Family doctor.org: Seasonal Affective Disorder
This article provides great information on Seasonal Affective Disorder, or SAD. The topics that are covered in this article include: what is seasonal affective disorder, How common is SAD, and is there a treatment for SAD.
Other
Guide to Seasonal Affective Disorder
This site give information on SAD, effects it has on people, and what causes it.