Unverified50% confidenceFactExact time
Morning light advances the biological clock, while evening light delays it; this time-dependent effect is described by the phase response curve (PRC).
1
Sources
50%
Confidence
Long-term
Relevance
10/6/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedThe typical human light-PRC shows that light exposure during the first half of the subjective night causes phase delay, light during the second half produces phase advance, and light during the daytime has almost no net effect (known as the dead zone).76% similarUnverifiedThe 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.73% similar
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