Nightmare disorder
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Nightmare disorder is a sleep disorder characterized by frequent awakening from nightmares with a vivid remembrance of the dream. It is often caused by a major stressful event or from the use of SSRIs, such as Prozac and Effexor. Most cases reported begin at the age of 10 after a stressful life event. The frequency of the episodes is varied form person to person; generally one will suffer from three or four episodes every week.
References
http://psychnet-uk.com/dsm_iv/nightmare_disorder.htm
Nightmares are a sub-category of Parasomnia Sleep Disorders.