American Academy of Sleep Medicine
http://www.aasmnet.org
American Sleep Apnea Association
http://www.sleepapnea.org
National Sleep Foundation
http://www.sleepfoundation.org
Narcolepsy Network
http://www.narcolepsynetwork.org
Restless Legs Syndrome Foundation
http://www.rls.org
General Sleep Info
http://www.sleepnet.com