Biological rhythms: cycles of life from circadian to annual Biological rhythms Biological rhythms are repetitive cycles in living organisms—daily, seasonal, tidal and more—driven by internal clocks and synchronized to the environment; they affect behavior, ph…
Circadian rhythm sleep disorders Circadian rhythm sleep disorder Conditions in which the body's internal clock is misaligned with the external day, causing sleep timing problems, daytime sleepiness or insomnia despite otherwise normal sleep dura…
