The circadian cycle is a natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours. Understanding your body's natural rhythm based on genetics will be beneficial in planning the fitness schedule, meal schedule, sleep time monitoring, etc.
Circadian rhythms are physical, mental and behavioural changes that follow a 24-hour cycle. These natural processes respond primarily to light and dark and affect most living things, including animals, plants and microbes. Chronobiology is the study of circadian rhythms. One example of a light-related circadian rhythm is sleeping at night and being awake during the day. The Average Teen Circadian Cycle image shows the circadian rhythm cycle of a typical teen.
Biological clocks are organisms' natural timing devices regulating the cycle of circadian rhythms. They're composed of specific molecules (proteins) that interact with cells throughout the body. Nearly every tissue and organ contains biological clocks. Researchers have identified similar genes in people, fruit flies, mice, plants, fungi and several other organisms that make the clocks' molecular components.
Changes in our body and environmental factors can cause our circadian rhythms and the natural light-dark cycle to be out of sync. These changes can cause sleep disorders and may lead to other chronic health conditions, such as obesity, diabetes, depression, bipolar disorder and seasonal affective disorder.
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