Narcolepsy is a sleep disorder characterized by irresistible daytime sleep attacks. It is caused by a chemical imbalance in the brain resulting in a lack of hypocretin, which regulates sleep. Symptoms include cataplexy, sleep paralysis, and hallucinations when falling asleep or waking up. There is no cure, but medications, lifestyle changes, and counseling can help manage symptoms by stabilizing sleep patterns and reducing daytime sleepiness and cataplexy episodes. It is difficult to diagnose due to low symptom awareness and variability, requiring tests like polysomnograms and spinal fluid analysis to confirm.