Nightmare Disorder is a sleep condition characterized by frequent, distressing nightmares that disrupt sleep. Individuals with this disorder often experience vivid dreams that provoke feelings of fear, anxiety, or terror, leading to awakenings. These nightmares typically occur during the REM sleep stage and can result in difficulty returning to sleep. People with Nightmare Disorder may experience daytime symptoms such as fatigue, irritability, or difficulty concentrating due to poor sleep quality. Treatment options include cognitive-behavioral therapy, medication, and relaxation techniques to help manage symptoms and improve overall sleep health.