Internal clocks, which are also known as biological clocks or circadian rhythms, are essential for regulating our sleep-wake cycles and other bodily functions. However, there are several other synonyms that can be used to describe this phenomenon. These include "body clock," "chronobiological rhythm," "endogenous rhythm," and "natural clock." Additionally, some scientists use the term "oscillators" to refer to the underlying mechanisms that drive our internal clocks. Regardless of the terminology used, our internal clocks play a vital role in maintaining our health and wellbeing, and disruption to these rhythms can lead to a range of health issues, including sleep disorders, depression, and metabolic disorders.