If a person consistently sleeps during daylight hours, which consequence follows regarding their melatonin production?

💡 Explanation

Melatonin secretion is suppressed by light exposure, because this is how the suprachiasmatic nucleus (SCN) regulates the circadian rhythm; therefore, daytime sleep leads to phase-delayed melatonin secretion, rather than unaffected or phase-advanced secretion, due to circadian disruption.

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