If a person consistently takes melatonin supplements late in the evening, what happens to their sleep patterns, regarding the natural circadian rhythm?

💡 Explanation

A circadian phase delay occurs because exogenous melatonin intake late in the evening shifts the body's internal clock later. Therefore, the sleep-wake cycle is pushed back, rather than slow-wave sleep increasing or REM sleep latency decreasing, which relate more to sleep depth and sleep onset, respectively.

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