» American Association of Medical Chronobiology and Chronotherapeutics    Provides an organizational framework for medical scientists, including academic and practicing physicians, interested in chronobiological phenomena.    http://www.aamcc.net

» Circadian Sleep Disorders Association    Support and providing information to those affected by circadian sleep disorders such as Delayed Sleep Phase Syndrome. Includes links, FAQs, message board and a mailing list.    http://www.circadiandisorders.org/

» Delayed Sleep Phase Syndrome    Comprehensive site with symptoms, causes, treatments, and links to further information on DSPS and circadian rhythms.    http://www.geocities.com/delayed_sleep/

» Light Sets the Molecular Controls of Circadian Rhythm    Work conducted at the Rockefeller University indicates that light can reset the biological clock.    http://www.rockefeller.edu/pubinfo/light.nr.html

» Mental Health Net - Circadian Rhythm Sleep Disorder Symptoms    General symptoms of circadian rhythm sleep disorder.    http://mentalhelp.net/disorders/sx92.htm

» Scientists Find Eye Pigment Controls Circadian Rhythm    A brief report on an eye pigment, cryptochrome, which appears to control mammals' circadian rhythms.    http://www.eurekalert.org/pub_releases/1998-11/UoNC-DECN-191198.php

» Society for Light Treatment and Biological Rhythms    A not-for-profit international organization founded in 1988 which aims to foster research, professional development and clinical applications in the fields of light therapy and biological rhythms.    http://www.websciences.org/sltbr/

» The Brain, Circadian Rhythms, and Clock Genes    British Medical Journal Article on circadian rhythms (1998). A clinical review.    http://www.bmj.com/cgi/content/full/317/7174/1704