The sleep cycle is a fascinating and intricate process that our bodies undergo every night. It consists of several distinct stages that repeat in a predictable pattern, ensuring that we experience both restorative and deep sleep. The sleep cycle is composed of two main categories: REM (Rapid Eye Movement) sleep and non-REM sleep. Non-REM sleep is further divided into three stages: N1, N2, and N3. During the sleep cycle, we transition between these stages multiple times, with each phase serving a unique purpose. N1 is the lightest stage, where we drift into slumber and may experience sudden muscle contractions. N2 follows, characterized by a decrease in body temperature and heart rate, as well as the appearance of sleep spindles and K-complexes in brain activity. The deepest and most restorative sleep occurs during N3, also known as slow-wave sleep. Finally, REM sleep arrives, marked by rapid eye movements, heightened brain activity, and vivid dreams. Understanding the sleep cycle is crucial for optimizing our sleep quality and overall well-being