If an adult hamster with a 24-hour endogenous rhythm receives a lesion to the SCN and a subsequent SCN transplant from a young hamster with an endogenous rhythm of 20 hours, the adult hamster will adopt a 20-hour rhythm will occur.
Exogenous rhythm is the term used to describe environmental variables that affect natural circadian rhythm cycles over the course of a twenty-four-hour period. These variables include light exposure, temperature, ambient noise, regular diet, different time zones, traumatic events, injuries, and occupational stress. Light-sensitive cells in the retina, which are responsible for the body's biorhythms' response to light absorption, set off physiological cues that correspond to sleep/wake cycles. If these cues are out of sync, sleep patterns might be disrupted.
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