nyctophobia
/nɪktəˈfoʊbiə/
noun
- An extreme or irrational fear of the dark or of night.
- Her nyctophobia made it impossible for her to sleep without a nightlight.
- The child's nyctophobia was so severe that he refused to go into any room without turning on all the lights first.
- Therapy helped him manage his nyctophobia so he could enjoy camping under the stars.