You searched for: “lygophily
lygophily (s) (noun) (no pl)
In psychiatry, a desire for gloomy or murky places; the love or fondness for blackness: Nancy's parents were quite concerned about their daughter wanting to paint her room black, have black curtains, and always wanting to wear black or dark clothes, so they went to see their doctor about this and he diagnosed her as having a case of lygophily which needed to be treated.