What are the symptoms of nightmare disorder?The main symptom of nightmare disorder is a pattern of nightmares. While it’s common to have nightmares every once in a while, if you have them frequently and they interfere with your daily functioning, you may have nightmare disorder.Common themes of nightmares include threats to your:SurvivalPhysical well-being.Security.You may also experience the following physical symptoms when you have a nightmare:Sweating.Shortness of breath.Racing heart.The main emotion nightmares cause is fear, although you may experience other emotions such as:AngerAnxiety.Embarrassment.Disgust.Shame.Sadness.These physical symptoms and emotions can occur during the dreaming episode, upon awakening from the nightmare or when later remembering the dream.Due to nightmare disorder, you may have:Mood disturbance, such as anxiety or depression.Sleep resistance.Fatigue.Daytime sleepiness (hypersomnia).Difficulty concentrating.Behavioral issues.Impaired functioning at work o...