- 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. - 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.
- 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.
- 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.
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