Nyctophobia
Encyclopedia
Nyctophobia is a phobia
Phobia
A phobia is a type of anxiety disorder, usually defined as a persistent fear of an object or situation in which the sufferer commits to great lengths in avoiding, typically disproportional to the actual danger posed, often being recognized as irrational...

 characterized by a severe fear of the darkness. It is triggered by the brain’s disfigured perception of what would or could happen when in a dark environment.

Despite its pervasive nature, there has been a lack of etiological
Etiology
Etiology is the study of causation, or origination. The word is derived from the Greek , aitiologia, "giving a reason for" ....

research on the subject. The fear of darkness (nyctophobia) is a psychologically-impacted feeling of being disposed from comfort to a fear-evoking state. The fear of darkness or night has several non-clinical terminologies—lygophobia, scotophobia and achluophobia. Nyctophobia is a phobia generally related to children but, according to J. Adrian Williams’ article titled, Indirect Hypnotic Therapy of Nyctophobia: A Case Report, many clinics with pediatric patients have a great chance of having adults who have nyctophobia. The same article states that “the phobia has been known to be extremely disruptive to adult patients and… incapacitating”.
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