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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.

Occasional nightmares are commonplace, but recurrent nightmares can interfere with sleep and may cause people to seek medical help. A recently proposed treatment consists of imagery rehearsal (PMID 15984916). This approach appears to reduce the effects of nightmares and other symptoms in acute stress disorder and post-traumatic stress disorder.^[1]

Lucid dreaming practitioners claim that it can help conquer nightmares of this type,^[2] rather than of the traditional type (see below).

Contents 1 Historic use of term 2 See also 3 Notes 4 References 5 External links

Nightmare was the original term for the state later known as waking dream (cf Mary Shelley and Frankenstein's Genesis), and more currently as sleep paralysis, associated with rapid eye movement (REM) sleep. The original definition was codified by Dr Johnson in his A Dictionary of the English Language and was thus understood, among others by Erasmus Darwin and Henry Fuseli, to include a "morbid oppression in the night, resembling the pressure of weight upon the breast."

Such nightmares were widely considered to be the work of demons and more specifically incubi, which were thought to sit on the chests of sleepers. In Old English, the being in question was called a mare or mære (from a proto-Germanic *marōn, related to Old High German and Old Norse mara), whence comes the mare part in nightmare.

The mythology of the Sea Island people of South Carolina and Georgia describes the negative figure of the Hag who leaves her physical body at night, and sits on the chest of her victim. The victim usually wakes with a feeling of terror, has difficulty breathing because of a perceived heavy invisible weight on his or her chest, and is unable to move i.e., experiences sleep paralysis. This nightmare experience is described as being "hag ridden" in the Gullah lore. The "Old Hag" was a nightmare spirit in British and also Anglophone North American folklore.

This type of waking dream is called mareridt in Danish, nachtmerrie in Dutch, malson in Catalan, cauchemar in French, mardraum or mareritt in Norwegian, pesadilla in Spanish, Albdruck, Albtraum (from Álf, Old Norse for Elf) or Nachtmahr (older) in German, incubo in Italian, mardröm in Swedish, painajainen in Finnish, luupainaja in Estonian, pesadelo in Portuguese, èmèng in Mandarin, gawi in Korean, karabasan in Turkish , kanashibari in Japanese and bakhtak in Persian.

Various forms of magic and spiritual possession were also advanced as causes. In nineteenth century Europe, the vagaries of diet were thought to be responsible. For example, in Charles Dickens's A Christmas Carol Ebenezer Scrooge attributes the ghost he sees to "... an undigested bit of beef, a blot of mustard, a crumb of cheese, a fragment of an underdone potato..." In a similar vein, the Household Cyclopedia (1881) offers the following advice about nightmares:

"Great attention is to be paid to regularity and choice of diet. Intemperance of every kind is hurtful, but nothing is more productive of this disease than drinking bad wine. Of eatables those which are most prejudicial are all fat and greasy meats and pastry... Moderate exercise contributes in a superior degree to promote the digestion of food and prevent flatulence; those, however, who are necessarily confined to a sedentary occupation, should particularly avoid applying themselves to study or bodily labor immediately after eating... Going to bed before the usual hour is a frequent cause of night-mare, as it either occasions the patient to sleep too long or to lie long awake in the night. Passing a whole night or part of a night without rest likewise gives birth to the disease, as it occasions the patient, on the succeeding night, to sleep too soundly. Indulging in sleep too late in the morning, is an almost certain method to bring on the paroxysm, and the more frequently it returns, the greater strength it acquires; the propensity to sleep at this time is almost irresistible."^[3]

• Sleep disorder
• Night terror
• Sleep paralysis
• Mara (folklore)
• Hag

• Max Eastman visited Sigmund Freud's apartment in Vienna, in 1926. He saw a print of Fuseli's The Nightmare, next to Rembrandt's The Anatomy Lesson. Ernest Jones chose another version of Fuseli's painting as the frontispiece of his book On the Nightmare, however neither Freud nor Jones mentioned those paintings in their writings about the classic nightmare.
• Recent exhibits: Gothic Nightmares: Fuseli, Blake and the Imagination. 15 February – 1 May (2006); Tate Britain, Millbank, London SW1P 4RG.
• When considered a disease, nightmares are classified as follows:
  • ICD-10 code = F51.5
  • ICD-9 code = 307.47

1. ^ http://jama.ama-assn.org/cgi/content/abstract/286/5/537
2. ^ http://www.ld4all.com/index.html#frames(content=while_nightmares.shtml)
3. ^ http://www.mspong.org/cyclopedia/medicine.html#nightmare

• Anch, A.M., & Browman, C.P., & Mitler, M.M., & Walsh, J.K. (1988). Sleep: A scientific perspective. New Jersey: Prentice-Hall, Inc.
• Harris J.C. (2004). Arch Gen Psychiatry. May;61(5):439-40. The Nightmare. (PMID 15123487)
• Jones, Ernest (1951). On the Nightmare (ISBN 0-87140-912-7) (pbk, 1971; ISBN 0-87140-248-3).
• Powell, Nicolas (1973). Fuseli: The Nightmare (ISBN 0-7139-0274-4).
• Forbes, D. et al. (2001) Brief Report: Treatment of Combat-Related Nightmares Using Imagery Rehearsal: A Pilot Study, Journal of Traumatic Stress 14 (2): 433-442
• Siegel, A. (2003) A mini-course for clinicians and trauma workers on posttraumatic nightmares.
• Burns, Sarah (2004). Painting the Dark Side : Art and the Gothic Imagination in Nineteenth-Century America. Ahmanson-Murphy Fine Are Imprint, 332 pp, University of California Press, ISBN 0-520-23821-4.
• Davenport-Hines, Richard (1999). Gothic: Four Hundred Years of Excess, Horror, Evil and Ruin. North Point Press, p160-61.
• Simons, Ronald C and Hughes, Charles C (eds.)(1985). Culture-Bound Syndromes. Springer, 536pp.
• Sagan, Carl (1997). The Demon-Haunted World: Science as a Candle in the Dark .

• Night-Mares: Demons that Cause Nightmares.
• Gothic Nightmares exhibit.
• Nightmare Project online archive of visitors' nightmares and comments.