Nightmare disorder | |
---|---|
The Nightmare, by Johann Heinrich Füssli | |
Specialty | Psychiatry |
Frequency | c. 4%[1] |
Nightmare disorder is a sleep disorder characterized by repeated intense nightmares that most often center on threats to physical safety and security.[2] The nightmares usually occur during the REM stage of sleep, and the person who experiences the nightmares typically remembers them well upon waking.[2] More specifically, nightmare disorder is a type of parasomnia, a subset of sleep disorders categorized by abnormal movement or behavior or verbal actions during sleep or shortly before or after. Other parasomnias include sleepwalking, sleep terrors, bedwetting, and sleep paralysis.[3]
Nightmare disorders can be confused with sleep terror disorders.[4] The difference is that after a sleep terror episode, the patient wakes up with more dramatic symptoms than with a nightmare disorder, such as screaming and crying.[4] Furthermore, they do not remember the reason of the fear, while a patient with a nightmare disorder remembers every detail of the dream.[4] Finally, the sleep terrors usually occur during NREM Sleep.[5][6]
Nightmares also have to be distinguished from bad dreams, which are less emotionally intense.[7] Furthermore, nightmares contain more scenes of aggression than bad dreams and more unhappy endings.[7] Finally, people experiencing nightmares feel more fear than with bad dreams.[7]
The treatment depends on whether or not there is a comorbid PTSD diagnosis.[1] About 4% of American adults are affected.[1] Studies examining nightmare disorders have found that the prevalence rates ranges 2–6% with the prevalence being similar in the US, Canada, France, Iceland, Sweden, Belgium, Finland, Austria, Japan, and the Middle East.[8]