Seasonal Affective Disorder describes depression that varies with the amount of sunlight. With less sunlight, one may get depressed. To have SAD, this would occur every year, and the depression would be more than "winter blues." During periods of greater sunlight, a degree of mania may occur, but that is not a prerequisite for this illness. In rare cases, the symptoms are reversed, with depression occurring during periods of increased sunlight.
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- Seasonal Affective Disorder Association An international support organization based in the United Kingdom. Provides information and membership details.
- Brighten Your Life An online book by a psychiatrist about bright light therapy for depression and sleep.
- Anyone Got a Light? Discusses phototherapy as a replacement for diminished light. (BBC)
- Society for Light Treatment and Biological Rhythms An international organization promoting research, professional development and clinical applications, with details of meetings and membership.
- Center for Environmental Therapeutics Non-profit organization dedicated to education and research on treatments for SAD, nonseasonal depression and circadian rhythm sleep disorders. Includes FAQ and self-assessment tool.
- Here to Help: Seasonal Affective Disorder Fact sheet includes suggested treatments, and advice on buying a lightbox.
- WebMD.com : Talk Therapy for Seasonal Affective Disorder? Discusses research study of cognitive behavioral therapy's effect on this disorder.
- Negative Ions Create Positive Vibes Discusses negative ions as an alternative therapy to depression.
- Overcoming SAD An interview with researcher Norman Rosenthal, MD.
- Clinical Trials: Seasonal Affective Disorder Solicits volunteers for current NIMH studies.
- Seasonal Affective Disorder: Winter Depression Discusses the diagnosis and treatment of this disorder. Covers related mood and sleep problems.
- What is Seasonal Affective Disorder? Pioneering research psychiatrist Norman E. Rosenthal presents an article on SAD.
- Mayo Clinic: Seasonal Affective Disorder (SAD) Describes symptoms, screening and treatment options.
- American Family Physician: Seasonal Affective Disorders An in depth, clinical discussion of this disorder.
- Seasonal Affective Disorder: Let the Sun Shine In When its Dark Outside A Salon.com article by a physician.
- Ayurveda Regime for Winter Depression Details treatment recommended by ayurvedic medicine physicians.
- Yahoo Groups: S-A-D Message board for sufferers.