Sleep Education is a wonderful site from the American Academy of Sleep Medicine with recent news and a wealth of educational material.
The Medlineplus page on Sleep Disorders is a very rich site developed by the US National Library of Medicine and the National Institute of Health.
The American Academy of Sleep Medicine (AASM) is the only professional society that is dedicated exclusively to the medical subspecialty of sleep medicine. As the leading voice in the field of sleep medicine, the AASM sets standards and promotes excellence in health care, education and research.
Alerting the public, healthcare providers and policymakers to the life-and-death importance of adequate sleep is central to the mission of the National Sleep Foundation.