The night hag is the name given to a supernatural creature, commonly associated with the phenomenon of sleep paralysis. It is a phenomenon in which the sleeper feels the 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 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 Albanian folk beliefs, Mokthi is believed to be a male spirit with a golden fez hat who appears to women who are usually tired or suffering and stops them from moving. It is believed that if they can take his golden hat, he will grant them a wish, but then he will visit them frequently although he is harmless. There are talismans that can provide protection from Mokthi and one way is to put one's husband's hat near the pillow while sleeping. Mokthi or Makthi in Albanian means "Nightmare". In Nigeria, "ISP appears to be far more common and recurrent among people of African descent than among whites or Nigerian Africans," and is often referred to within African communities as "the Devil on your back." and is called "Dannau" by the Hausa people 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 (Thai: 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.
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