Whats wrong with my wife ? [I Marriage]

My wife has a hard time sleeping she's always done this she said since she was a teenager. What's strange is she loves horror movies but when she sees a haunted show on TV it makes her not want to sleep. She can sleep everywhere else in the dark after watching them. She can even sleep at her grandma's house who lives in a dangerous part of town. When she sees a skull or a skeleton or sees one of those haunted shows on the travel channel she has to sleep with the tv on for a week or a few days. I don't know how she does it it hurts my eyes. She said there was a show on the old discovery health channel when she was a teenager that scared her that made her do this. She's got a nightlight and a glow in the dark charger and the hallway light is kept on she still has to have the TV on. How can I help her with this proble ?