Nobody worries excessively after an occasional nightmare, but if with acute stress disorder these nightmares could become more frequent. The mind retains images of the disturbing event or scene they experienced, and this provides material for nightmares. It might reach a point where they dread falling asleep out of fear of these terrifying dreams. Psychotherapy can help this person rid him or herself of these "demons" and manage once again to get an undisturbed sleep.

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