Circadian rhythm sleep disorder (CRSD) is a medical condition that disrupts an individual's natural sleep-wake cycle. There are several synonyms used to talk about this condition, such as circadian rhythm disorder, sleep-wake disorder, and biological clock disruption. CRSD is a neurological disorder that affects a person's ability to fall asleep or wake up on a regular schedule, leading to fatigue, insomnia, and various other symptoms. Treatment for this condition may include therapies like light therapy, medication, and lifestyle modifications. While CRSD may impact someone's social and professional life, early recognition and treatment can effectively mitigate the adverse consequences of this condition.