The Sleep Cycle refers to the natural progression of sleep stages that occur throughout the night. Each cycle typically lasts about 90 minutes and includes various stages, such as light sleep, deep sleep, and REM sleep. These stages play crucial roles in physical restoration, memory consolidation, and emotional regulation. During a typical night, a person may experience four to six sleep cycles. The duration and quality of these cycles can be influenced by factors like stress, diet, and sleep environment. Understanding the sleep cycle can help individuals improve their sleep quality and overall well-being.