Nyctophobia

common fear or phobia among children and, to a varying degree, adults

Fear of the dark is a common fear or phobia among children and, to some degree, adults.[1][2] In severe cases, it has the name of nyctophobia or scotophobia or lygophobia.

Nightlights, such as this one, may be used to counteract fear of the dark.
Dark causes fear because of its unknown

References

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  1. Jersild, Arthur T. 2007. Children's fears. Read Books, p. 173. ISBN 1406758272.
  2. Mikulas, William L. 1985. Behavioral bibliotherapy and games for treating fear of the dark. Child & Family Behavior Therapy 7 3, p1-7.