Circadian rhythm disorders are conditions that disrupt the body's natural sleep-wake cycle, which is regulated by an internal clock known as the circadian rhythm. This rhythm influences various biological processes, including sleep, hormone release, and body temperature. When this cycle is misaligned, individuals may experience difficulties falling asleep, staying awake, or maintaining a regular sleep pattern. Common types of circadian rhythm disorders include delayed sleep phase disorder, where a person struggles to fall asleep until late at night, and shift work disorder, which affects those who work non-traditional hours. These disorders can lead to sleep deprivation, fatigue, and other health issues if not properly managed.