Light-Induced Melatonin Suppression
Pineal Gland, Melatonin and Circadian Rhythms
Light-Induced Melatonin Suppression
Light exposure during biological night can suppress melatonin according to intensity, spectrum, duration and timing.
Biological time and endocrine output
Light information helps synchronize the central clock, which coordinates pineal and wider endocrine timing through neural pathways. Peripheral clocks also respond to metabolic and behavioral cues. Clock time and internal circadian phase can diverge during travel or shift work.
Interpreting the mechanism
A clock-time description alone does not predict the magnitude.
Timing rather than one level
A single melatonin or cortisol concentration does not describe an entire rhythm. Light exposure, sleep schedule and sampling conditions matter. Interpreting a phase shift requires a time series or an appropriately validated phase marker.
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