night terror, also known as a sleep terror or pavor nocturnus, is a parasomnia disorder that predominantly affects children, causing feelings of terror or dread. Night terrors should not be confused with nightmares, which are bad dreams that cause the feeling of horror or fear. An estimated 1-6% of children have at least one night terror in their life but have no memory of the occurrence.

Children from age two to six are most prone to night terrors. They affect about fifteen percent of all children, although people of any age can be affected. Episodes may happen for a couple of weeks then suddenly disappear. The symptoms also tend to be different, with the child being unable to recall the experience. While nearly arisen, hallucinations occur.

Children who have night terrors are usually described as ‘bolting upright’ with their eyes wide open, and a look of fear and panic. They will often scream. Further, they will usually sweat, breathe fast and have a rapid heart rate (autonomic signs). Although it seems like children are awake during a night terror, they will appear confused, be inconsolable, and will not recognize others.

Strong evidence has shown that a predisposition to night terrors and other parasomniac disorders can be passed genetically. Though there are a multitude of triggers, emotional stress during the previous day and a high fever are thought to precipitate most episodes. Ensuring the right amount of sleep is an important factor. Special consideration must be used when the subject suffers from narcolepsy, as there may be a link.

Though the symptoms of night terrors in adolescents and adults are similar, the etiology, prognosis and treatment are qualitatively different. These night terrors can occur each night if the sufferer does not eat a proper diet, get the appropriate amount or quality of sleep (e.g. sleep apnea), is enduring stressful events in their life or if they remain untreated. Adult night terrors are much less common, and often respond to treatments to rectify causes of poor quality or quantity of sleep. There is no scientific evidence of a link between night terrors and mental illness. There is some evidence of a link between adult night terrors and hypoglycemia. In addition to night terrors, some adult night terror sufferers have many of the characteristics of depressed individuals including inhibition of aggression, self-directed anger, passivity, anxiety, impaired memory, and the ability to ignore pain. When a night terror happens it is typical that person can wake themself up screaming, kicking, and often can not make out what they are saying. Often the person can even run out of the house (more common among adults) which can then lead to violent actions.

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