Although the precise causes of nightmares remain a mystery, recent sleep research has shed some light on the subject, and has divided nightmares into three broad categories: 1) chronic, lifelong nightmares that are phenomena of personality, 2) traumatic nightmares related to Post-Traumatic Stress Disorder (PTSD), and 3) drug-induced nightmares. All of these are related to a hyper-activity of the nervous system.
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