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Nightmare disorder
Nightmare disorder, also known as 'dream anxiety disorder', is a sleep disorder characterized by frequent nightmares. The nightmares, which often portray the individual in a situation that jeopardizes their life or personal safety, usually occur during the REM stages of sleep. Though such nightmares occur within many people, those with nightmare disorder experience them with a greater frequency. The disorder's DSM-IV number is 307.47.
== Symptoms ==
During the nightmare, the sleeper may scream and yell out things. The victim is often awakened by these threatening, frightening dreams and can often vividly remember their experience. Upon awakening, the sleeper is unusually alert and oriented within their surroundings, but may have an increased heart rate and symptoms of anxiety, like sweating. They may have trouble falling back to sleep for fear they will experience another nightmare.
A person experiencing nightmare disorder would have trouble going through everyday tasks; the anxiety and lack of sleep caused by the fearful dreams would hinder the individual from completing everyday jobs efficiently and correctly. Upon experiencing this, these victims should seek an immediate source of a psychiatrist.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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