Outside In  
   Information about Seasonal Affective Disorder (SAD) and other body clock related conditions. jetlag, sundowning, a jetlag calculator, symptoms checklist, research. Light therapy devices and other helpful light products. Link to Bio-Brite for US visitors
   http://www.outsidein.co.uk

Society for Light Treatment and Biological Rhythms  
   Not-for-profit international organization founded in 1988, dedicated to fostering research, professional development and clinical applications in the fields of light therapy and biological rhythms.
   http://www.sltbr.org/

Sunnex Lo-Lite: Therapy for Seasonal Affective Disorder  
   Describes the symptoms of SAD, explains why they respond to light therapy and the benefits of using Sunnex LoLITE lamps to avoid the risk of retinal damage from bright light.
   http://www.sunnexbiotech.com/frames/sad.html

Seasonal Affective Disorder Association  
   Support organisation in the UK. Information and membership details.
   http://www.sada.org.uk/

SAD Study  
   Focused on the diagnosis, symptomatology,epidemiology, and light therapy of SAD.
   http://www.mentalhealth.com/book/p40-sad.html

Seasonal Affective Disorder  
   Information on the diagnosis and treatment of seasonal depression, jet lag and related mood and sleep problems.
   http://www.ncpamd.com/seasonal.htm

SAD - Seasonal Affective Disorder  
   Newsletter about seasonal affective disorder for mental health professionals and SAD sufferers.
   http://athealth.com/Practitioner/Newsletter/FPN_3_2.html

SAD Info - Light Therapy Products  
   FAQ and products for Seasonal Affective Disorder. Answers about light therapy. Links to products for SAD including light boxes, dawn simulators, light visor, winter blues book and full spectrum neodymium light bulbs for a better quality of light.
   http://www.lighttherapyproducts.com/sadinfo.html

When the Dark Days of Winter Approach  
   Dr Norman Rosenthal, who pioneered the study of SAD. Biography, list of publications, forthcoming speaking engagements and links.
   http://www.normanrosenthal.com/

Seasonal Depression and Light Therapy  
   Article from the UK's National Institute for Medical Research.
   http://www.nimr.mrc.ac.uk/MillHillEssays/1997/sad.htm

University of British Colombia Mood Disorders Centre  
   Information, articles and links.
   http://www.psychiatry.ubc.ca/mood/sad

SAD and Depression  
   Definition and treatment of seasonal affective disorder; links to other sites about SAD.
   http://www.findarticles.com/m3225/5_61/61432742/p1/article.jhtml

SAD evaluations and treatment information  
   Information and free on-line and downloadable self-assessment instruments.
   http://www.cet.org

Brighten Your Life  
   An online book by a psychiatrist about bright light therapy for depression and sleep.
   http://www.brightenyourlife.info/

eMedicine Health Seasonal Depression (SAD)  
   provides an overview of seasonal depression and its causes, symptoms, and treatment.
   http://www.emedicinehealth.com/articles/10333-1.asp