Nightmare disorder is defined as recurring incidences of distressed, prolonged, and memorable nightmares that usually include threats to the person’s life.

Nightmare Disorder

A long, frightening dream that awakens a person from REM sleep.

University of Rochester

A stage of sleep which shows small amplitude, fast EEG waves, no postural tension, and rapid eye movements. The waves of REM sleep closely resembles that of waking. 
- Nightmare

Rapid-eye-movement sleep (REM sleep)

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

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