Kelley Davis and Daniel Davis (Photos: Pasco County Sheriff's Office) SPRING HILL, Fla. - Deputies arrested a Spring Hill couple on child abuse charges after a child set a mattress on fire to escape a locked, darkened bedroom.Pasco County Sheriff Chris Nocco said the victim had been locked in a room with both the windows and door boarded up so the child could not escape and so no light could get through.Only a blanket and a mattress were inside the room, and investigators said the circuit breaker to the room had been purposely turned off to deprive the child of electricity.RELATED: Police: Florida woman left 7 children alone for months; kids said they'd rather go to foster careThe sheriff's office said the couple, 37-year-old Daniel Davis.