- 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.
- American Society for Gravitational and Space Biology -- Desert Beetle Circadian Rhythm Study Begins - 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.
- The Brain, Circadian Rhythms, and Clock Genes - British Medical Journal Article on circadian rhythms (1998). A clinical review.
- Center for Biological Timing Home Page - The National Science Foundation Center for Biological Timing. Tutorials and original papers on biological timing.
- Light Sets the Molecular Controls of Circadian Rhythm - Work conducted at the Rockefeller University indicates that light can reset the biological clock.
- Mental Health Net - Circadian Rhythm Sleep Disorder Symptoms - General symptoms of circadian rhythm sleep disorder.
- 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.
- 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.
- Scientists Find Eye Pigment Controls Circadian Rhythm - A brief report on an eye pigment, cryptochrome, which appears to control mammals' circadian rhythms.
- Delayed Sleep Phase Syndrome - Comprehensive site with symptoms, causes, treatments, and links to further information on DSPS and circadian rhythms.
- Dr. Postolache - The Institute for Sports Chronobiology - Consulting on optimizing sports performance via optimizing sleep-wake schedules and biological rhythms.
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