prevalence of nightmares in children (5-12 years old) is between 20 and 30%; the prevalence in adults is between 8 and 30%. In common language, the meaning of nightmare has extended as a metaphor to many bad things, such as a bad situation or a scary monster or person.

Etymology

The word nightmare is derived from the European folklorical "mare" ( , mære, ), a mythological female demon or thereof, which sits on the chest of sleeping people and

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