
1) Fear of the dark 2) Simple phobia
Found on
https://www.crosswordclues.com/clue/nyctophobia

Nyctophobia (from Greek νυκτός, nyktos, genitive of νύξ, nyx, `night` and φόβος, phobos, `fear`) is a phobia characterized by a severe fear of the dark. 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 etiologi...
Found on
http://en.wikipedia.org/wiki/Nyctophobia

fear of the night or darkness
Found on
http://phrontistery.info/n.html

<psychology> Fear of night. ... Origin: Gr. Phobos = fear ... (16 Mar 1998) ...
Found on
http://www.encyclo.co.uk/local/20973

(nik″to-fo´be-ә) irrational fear of darkness.
Found on
http://www.encyclo.co.uk/local/21001

Type: Term Pronunciation: nik-tō-fō′bē-ă Definitions: 1. Morbid fear of night or of the dark. Synonyms: scotophobia
Found on
http://www.medilexicon.com/medicaldictionary.php?t=61931

Nyctophobia: Pathological fear of the dark, an abnormal and persistent dread of the dark. Sufferers experience anxiety even though they may rationally realize that the dark does not pose a threat commensurate with their fear. Formed from the Greek 'nyx' (night) and the Greek 'phobos' (fear). 'Nyx' has also contributed to other medical terms such as...
Found on
http://www.medterms.com/script/main/art.asp?articlekey=11759

Nyctophobia is the fear of night.
Found on
http://www.probertencyclopaedia.com/browse/EN.HTM

[
n] - a morbid fear of night or darkness
Found on
http://www.webdictionary.co.uk/definition.php?query=nyctophobia

nyctophobia, nyctiphobia An irrational fear of the dark.
Found on
http://www.wordinfo.info/words/index/info/view_unit/2563/2

nyctophobia, nyktosophobia An abnormal fear of darkness or night. Examples of this phobia include not going out at night and making sure that there are plenty of lights on in ones residence.
Found on
http://www.wordinfo.info/words/index/info/view_unit/2723/23
noun a morbid fear of night or darkness
Found on
https://www.encyclo.co.uk/local/20974

an abnormal fear of night or darkness.
Found on
https://www.infoplease.com/dictionary/nyctophobia
No exact match found.