Biological rhythms are the natural cycles that regulate various physiological processes in living organisms. These rhythms are innate and follow specific patterns, often influenced by external cues such as light, temperature, and social interactions. Among the various biological rhythms, two prominent ones are the circadian rhythm and theinfradian rhythm. These rhythms play crucial roles in our daily lives, affecting everything from sleep-wake cycles to reproductive patterns. In this article, wediscuss the intricacies of these rhythms, exploring their mechanisms, significance, and how they impact human health.