Reference Terms
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Nightmare

In common current usage, the term nightmare refers to dreams of particular intensity, with content that the sleeper finds disturbing, related either to physiological causes, such as a high fever, or to psychological ones, such as unusual trauma or stress in the sleeper's life.

The occasional body movements seen in nightmares may have a use in awakening the sleeper, thus helping to avoid the frightening dream-situation.

Note:   The above text is excerpted from the Wikipedia article "Nightmare", which has been released under the GNU Free Documentation License.
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August 31, 2015

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