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6. The Role of Circadian Rhythms

Circadian rhythms refer to the typical behavior patterns of a 24-hour cycle, and these rhythms have a profound impact on human hormones, eating habits, and body temperatures. In humans, the Period and Cryptochrome genes maintain circadian rhythms and naturally help regulate sleepiness by coding proteins that reside in a cell's nucleus. However, signals from the environment (most often different types of light) can influence when and how these genes turn on or off. When light disrupts the genes and circadian rhythm, many people find it difficult to sleep.

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