Night hag

The night hag or old hag is the name given to a supernatural creature, commonly associated with the phenomenon of sleep paralysis. It is a phenomenon during which a person feels a presence of a supernatural malevolent being which immobilizes the person as if sitting on their chest or the foot of their bed. The word "night-mare" or "nightmare" was used to describe this phenomenon before the word received its modern, more general meaning. Various cultures have various names for this phenomenon and/or supernatural character.

Sleep paralysis

The original definition of sleep paralysis was codified by Samuel Johnson in his ''A Dictionary of the English Language'' as ''nightmare'', a term that evolved into our modern definition. Such sleep paralysis was widely considered the work of demons, and more specifically incubi, which were thought to sit on the chests of sleepers. In Old English the name for these beings was ''mare'' or ''mære'' (from a proto-Germanic ''*marōn'', cf. Old Norse '' mara''), hence comes the ''mare'' part in ''nightmare''. The word might be etymologically cognate to Greek ''Marōn'' (in the Odyssey) and Sanskrit ''Māra''.

Folklore

* In Scandinavian folklore, sleep paralysis is caused by a mare, a supernatural creature related to incubi and succubi. The mare is a damned woman, who is cursed and her body is carried mysteriously during sleep and without her noticing. In this state, she visits villagers to sit on their rib cages while they are asleep, causing them to experience nightmares. The Swedish film ''Marianne'' examines the folklore surrounding sleep paralysis.
* Folk belief in Newfoundland in Canada and South Carolina and Georgia in the United States describe 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.
* In Fiji, the experience is interpreted as ''kana tevoro'', being "eaten" by a demon. In many cases the demon can be the spirit of a recently dead relative who has come back for some unfinished business, or has come to communicate some important news to the living. Often persons sleeping near the afflicted person say ''kania, kania'', "eat! eat!" in an attempt to prolong the possession for a chance to converse with the dead relative or spirit and seek answers as to why he or she has come back. The person waking up from the experience is often asked to immediately curse or chase the spirit of the dead relative, which sometimes involves literally speaking to the spirit and telling him or her to go away or using expletives.
* In Nigeria, "ISP appears to be far more common and recurrent among people of African descent than among whites or Nigerian Africans,"Hersen, Turner & Beidel. (2007) Adult Psychopathology and Diagnosis. p. 380 and is often referred to within African communities as "the Devil on your back."Mattek, (2005) Memoirs p. 34
* In Turkey sleep paralysis is called ''Karabasan'', and is similar to other stories of demonic visitation during sleep. A supernatural being, commonly known as a ''jinn'' (''cin'' in Turkish), comes to the victim's room, holds him or her down hard enough not to allow any kind of movement, and starts to strangle the person. To get rid of the demonic creature, one needs to pray to Allah by reading Al-Falaq and Al-Nas from the Qur'an. Moreover, in some derivatives of the stories, the jinn has a wide hat and if the person can show the courage and take its hat, the djinn becomes his slave.
* In Thailand it is believed that sleep paralysis and discomfort is caused by a ghost of the Thai folklore known as ''Phi Am'' ( th, ผีอำ). Some people claim that this spirit may even cause bruises. Stories about this spirit are common in Thai comics.
* In the Southern United States, it is sometimes referred to as "witch riding".
* In Eastern Chinese folklore, it is thought that a mouse can steal human breath at night. Human breath strengthens the mouse, allowing it longevity and the ability to briefly become human at night, in a similar fashion to fox spirits. The mouse sits near the person's face or under their nostrils.

East Asia

* In Chinese culture, sleep paralysis is widely known as "鬼壓身/鬼压身" (pinyin: guǐ yā shēn) or "鬼壓床/鬼压床" (pinyin: guǐ yā chuáng), which literally translates into "ghost pressing on body" or "ghost pressing on bed." A more modern term is "夢魘/梦魇" (pinyin: mèng yǎn).
* In Japanese culture, sleep paralysis is referred to as ''kanashibari'' ( 金縛り), literally "bound or fastened in metal," from "kane" (metal) and "shibaru" (to bind, to tie, to fasten). This term is occasionally used by English speaking authors to refer to the phenomenon both in academic papers and in pop psych literature.
* In Korean culture, sleep paralysis is called ''gawi nulim'' (), literally, "being pressed down by something scary in a dream." It is often associated with a belief that a ghost or spirit is lying on top of or pressing down on the sufferer.
* In Mongolian culture, nightmares in general as well as sleep paralysis is referred to by the verb-phrase ''khar darakh'' (written kara darahu), meaning "to be pressed by the Black" or "when the Dark presses." ''Kara'' means black, and may refer to the dark side personified. ''Kharin buu'' means "shaman of the black" (shamans of the dark side only survive in far-northern Mongolia), while ''tsaghaan zugiin buu'' means "shaman of the white direction" (referring to shamans who only invoke benevolent spirits). Compare 'karabasan' (the dark presser) in Turkish, which may date from pre-Islamic times when the Turks had the same religion and mythology as the Mongols. See Mythology of the Turkic and Mongolian peoples and Tengriism.
* In Tibetan culture, sleep paralysis is often known as ''dip-non'' (གྲིབ་གནོན་ - Kham) or ''dip-phok'' (གྲིབ་ཕོག་ - Ladakh), which translates roughly as "oppressed/struck by ''dip''"; ''dip'', literally meaning shadow, refers to a kind of spiritual pollution.

South-East Asia

* In Cambodian, Lao, and Thai culture sleep paralysis is called ''phǐǐ am'' (, ) and ''khmout sukkhot''. It is described as an event in which the person is sleeping and dreams that one or more ghostly figures are nearby or even holding him or her down. The sufferer is unable to move or make any noises. This is not to be confused with ''pee khao'' and ''khmout jool'', ghost possession.
* In Hmong culture, sleep paralysis is understood to be caused by a nocturnal pressing spirit, ''dab tsog''. ''Dab tsog'' attacks "sleepers" by sitting on their chests, sometimes attempting to strangle them. Some believe that ''dab tsog'' is responsible for sudden unexpected nocturnal death syndrome (SUNDS).
* In Vietnamese culture, sleep paralysis is called ''ma đè'', meaning "held down by a ghost," or ''bóng đè'', meaning "held down by a shadow."
* In Philippine culture, '' bangungot'' has traditionally been attributed to nightmares. Batibat or '' bangungot'' has been believed to takes on a form of grotesque, obese woman who sat on her victim's chest. People who claim to survive such nightmares report symptoms of sleep paralysis.
* In Malay of Malay Peninsula, sleep paralysis is known as ''kena tindih'' (or ''ketindihan'' in Indonesia), which means "being pressed." Incidents are commonly considered the work of a malign agency; occurring in what are explained as blind spots in the field of vision, they are reported as demonic figures.

South Asia

* In Kashmiri mythology this is caused by an invisible creature called a "Roch", Some people believe that a "Roch" lives in every house and attacks somebody if the house has not been cleaned.One also experiences this if one has been doing something evil, satanic or derives pleasure from the misfortunes of others.This creature is also known as "pasikdhar"or a "sayaa"or as "GharDivta" by Kashmiri Pandits (Kashmiri aboriginals with hindu faith)
* In Pakistan, sleep paralysis is considered an encounter with ''Shaitan'' (Urdu