Nightmares may or may not have a connection to the events of a person’s daily life, but they more commonly do when the individual is experiencing post- traumatic stress disorder, of which “re ... Nightmare disorder is a parasomnia that occurs when a person has frequent nightmares that interfere with their sleep, mood, and/or daytime functioning. While most people have nightmares from time to time, nightmare disorder is far less common. Concert events listed are based on the artist featured in the video you are watching, channels you have subscribed to, your past activity while signed in to YouTube , including artists you search ... Nightmares are dreams that are scary or disturbing. The themes of nightmares vary widely from person-to-person, but common themes include being chased, falling, or feeling lost or trapped.