Melatonin is essential for regulating sleep-wake cycles, acting as the 'hormone of darkness' since it is released primarily at night. Exposure to natural daylight during the day inhibits melatonin release, signaling to the body that it is daytime and time to be awake, a vital process for diurnal species like humans. In contrast, excessive artificial light in the evening can disrupt this cycle by delaying melatonin's release and contributing to a state of 'darkness deprivation.' Reducing exposure to 'junk light' in the evening is crucial for maintaining healthy melatonin levels and achieving restorative sleep.

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