Light and the Circadian Cycle

A circadian cycle or rhythm is any biological process that displays an internal, entrainable oscillation of about 24 hours. Entrainment, within the study of chronobiology, occurs when rhythmic physiological or behavioral events match their period and phase to that of an environmental oscillation. Although circadian rhythms are endogenous (“built-in”, self-sustained), they are adjusted (entrained) to the local environment by external … Continue reading