Participants and Design: Participants are 3-8-year-old children who exhibit disruptive behaviors and their parents. Participants meeting criteria for the parent-training program offered as part of the general clinic practice would be approached by the therapist to discuss participation in the study. Following the consent procedure, they would be randomly assigned to one of two groups. The sleep intervention group would receive a brief, novel sleep intervention (The Sleep Train Program) in the context of the parenting program's Setting Up for Success segment, which focuses on positive routines. Sleep would be addressed briefly as needed in subsequent sessions. The mealtime/control group would not receive any particular intervention or guidance regarding sleep, but would instead focus on the routine of mealtimes. All families would then receive the same core intervention for disruptive behavior. Following the completion of the data collection, families who received the sleep component would receive the mealtime component, and vice versa.