About Sleep Disorders Authoritative information about sleep disorders. "The International Classification of Sleep Disorders (ICSD) lists over 84 different types..."
Sleep Disorder Centers Big alphabetized list of Sleep Disorder clinics, mostly in the U.S. with a few overseas.
Sleep Medicine Page Resources regarding all aspects of sleep" A huge list of links, supposedly updated recently, yet many links were not working when I visited.
SleepApneaInfo.com Information about periods of breathlessness during sleep.
This web site contains lots of psychology-related information counseling & psychiatry issues & specific resources in humanistic, general sociology, religion & philosophy.