» Center for Biological Timing Home Page - The National Science Foundation Center for Biological Timing. Tutorials and original papers on biological timing.
» 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.
» Delayed Sleep Phase Syndrome - Comprehensive site with symptoms, causes, treatments, and links to further information on DSPS and circadian rhythms.
» 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.