Also known as post-traumatic nightmare. Both terms are used to denote a type of " nightmare characterized by a long, frightening " dream during which a traumatic event is re-experienced exactly as it actually happened. Traumatic nightmares tend to occur during REM sleep, but they have occasionally been reported during stage N2 sleep as well (i.e. a light sleep, characterized on the electroencephalogram (EEG) by sleep spindles and K complexes). Although a certain phenomenological parallel exists between traumatic nightmares and " reperceptive hallucinations, traumatic nightmares are traditionally set apart from the group of "hallucinations proper because they occur during sleep.
References
Hartmann, E. (1984). The nightmare. The psychology and biology ofterrifying dreams. New York, NY: Basic Books.
Dictionary of Hallucinations. J.D. Blom. 2010.