Nightlights, such as this one, may be used to counteract fear of the dark.
Dark causes fear because of its unknown
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.
References
↑Jersild, Arthur T. 2007. Children's fears. Read Books, p. 173. ISBN 1406758272.
↑Mikulas, William L. 1985. Behavioral bibliotherapy and games for treating fear of the dark. Child & Family Behavior Therapy7 3, p1-7.