Links to more information:

American Academy of Sleep Medicine
http://www.aasmnet.org

American Board of Sleep Medicine
http://www.absm.org

American Fibromyalgia Syndrome Association
http://www.afsafund.org

American Sleep Apnea Association
http://www.sleepapnea.org

Association of Polysomnographic Technologists
http://www.aptweb.org

Books for Sleepless Nights (Sleep book reviews)
http://www.sleephomepage.org/books

German Sleep Society
http://www.uni-marburg.de/sleep/dgsm/welcome_.html

Heart, Blood and lung
http://www.nhlbi.nih.gov/health/public/sleep/index.htm

Narcolepsy Network
http://www.narcolepsynetwork.org

National Sleep Foundation
http://www.sleepfoundation.org

Restless Legs Syndrome Foundation
http://www.rls.org

Sleep Net
http://www.sleepnet.com

Society for Light and Biological Rhythms
http://www.sltbr.org