Bio-rhythms refer to the biological cycles that regulate our physical, emotional and mental wellbeing. Some synonyms that can be used interchangeably for bio-rhythms include circadian rhythms, body clock, biological clock, internal clock, natural rhythms, and physiological cycles. These terms all refer to the self-regulating processes in the body that govern our sleeping and eating patterns, hormone secretion, and cognitive abilities. Understanding our bio-rhythms can help us make more informed choices about our daily routines and improve our overall health and wellbeing. Whether we choose to call it a body clock or a physiological cycle, the importance of respecting and optimizing our bio-rhythms cannot be overstated.