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/

American Society for Gravitational and Space Biology -- Desert Beetle Circadian Rhythm Study Begins on Mir  
   When Space Shuttle Atlantis docked with Mir on May 15, it delivered 64 desert beetles for a circadian rhythm study to understand how the space flight environment changes the body's internal clock.
   http://asgsb.indstate.edu/newsletter/v13_2/beetle.html

American Association of Medical Chronobiology and Chronotherapeutics  
   Details about the AAMCC who provides an organizational framework for scientists and health care professionals interested in the medical application of chronobiology and chronotherapeutics.
   http://www.aamcc.org

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

Dawn Simulators  
   A look at a stimulating apparatus to help with Seasonal Affective Disorder.
   http://www.pi-square.com/

Center for Biological Timing Home Page  
   The National Science Foundation Center for Biological Timing. Tutorials and original papers on biological timing.
   http://www.cbt.virginia.edu/index.html

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

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/

Outside In Home Page : Info on SAD, Body Clock, Jetlag, Winter Depression and Light  
   Light products and information on biological clock problems. Jet-lag calculator. Sales worldwide.
   http://www.outsidein.co.uk/

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

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

Dr. Postolache - The Institute for Sports Chronobiology  
   Consulting on optimizing sports performance via optimizing sleep-wake schedules and biological rhythms.
   http://www.drpostolache.com