Despite the high prevalence of sleep difficulties in children with disruptive behavior disorders, little is known about the role of sleep in treating disruptive behavior. The current study evaluates the addition of a sleep intervention to an existing parent-training program for caregivers of children ages 3-8 with disruptive behaviors. Objectives are to examine the impact of a novel sleep treatment program on sleep, disruptive behavior, and other measures of family functioning, utilizing a variety of self-report and objective measures (e.g. actigraphy, electrodermal activity). The investigators hypothesize that sleep intervention will result in improvements in sleep and disruptive behavior compared to control group receiving a highly plausible addition to the standard parent training intervention, and that sleep outcomes will moderate overall treatment success.