Verified65% confidenceFactExact time
The circadian rhythm is driven by the master clock located in the suprachiasmatic nucleus (SCN) of the hypothalamus, which is calibrated by light signals received through the retina.
3
Sources
65%
Confidence
Long-term
Relevance
8/16/2026
First Seen
Sources
Related Claims
UnverifiedThe circadian rhythm is the body's approximately 24-hour physiological timing system, which relies on external environmental cues for continuous calibration, with light being the strongest calibration signal.72% similarUnverifiedArtificial lighting at night (especially blue light) suppresses melatonin and disrupts the SCN's entrainment signals to the HPA axis.71% similarUnverifiedMorning light advances the biological clock, while evening light delays it; this time-dependent effect is described by the phase response curve (PRC).69% similar
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