Circadian rhythms are natural, internal processes that regulate the sleep-wake cycle and other bodily functions over a 24-hour period. These rhythms are influenced by external cues like light and temperature, helping our bodies know when to sleep, eat, and be active. For example, when the sun rises, our bodies produce melatonin, a hormone that makes us feel awake. These rhythms are crucial for maintaining good health. Disruptions, such as shift work or irregular sleep patterns, can lead to problems like insomnia or depression. Understanding and respecting our circadian rhythms can improve our overall well-being and enhance our daily performance.