- Circadian Rhythm Laboratory
 - Provides research on biological rhythms, thermal physiology, data analysis, and academic issues. - Circadian Rhythms
- Provides charts, definitions, and examples of the circadian clock in fungi, plants, invertebrates, and mammals.
- CircadianSleep.com
- An overview of circadian rhythms and related topics of chronobiology, common sleep disorders, human reliability, actigraphy, and circadian rhythm sleep disorders.
- Experiments Confirm Novel Eye Pigment Controls Circadian Rhythm
- A brief report by scientists at the University of North Carolina who say an eye pigment, cryptochrome, may control mammals' circadian rhythms.
- Journal of Circadian Rhythms
- Publishes papers on all aspects of circadian and nycthemeral (daily) rhythms in living organisms, including processes associated with photoperiodism and daily torpor.
- Wikipedia: Circadian Rhythm
- User-edited article about the "internal body clock" that regulates the (roughly) 24-hour cycle of biological processes in animals and plants.
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