Analyze the following scenario by identifying the key internal biological structure responsible for the described experience. Explain why this structure is temporarily out of sync with the new environment and identify the most critical external signal that will help it realign over time.

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The sleep-wake cycle is a fundamental circadian rhythm that is internally regulated by the body's biological clock. This process governs the daily pattern of sleeping and waking, ensuring it is synchronized with the 24-hour light-dark cycle of the environment.

Sleep-Wake Cycle

A person's chronotype refers to the inherent individual differences in their circadian patterns of activity. These variations explain why some people are 'morning people' (morning larks) while others are 'night owls,' and research indicates that these different chronotypes are linked to differences in sleep regulation.

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