Background: Sleep disturbances are a significant problem for people with autism spectrum disorder (ASD). Existing research supports the use of parent-implemented, functional behavior assessment (FBA)-informed interventions for sleep problems in children with ASD. There is also emerging evidence for combined parent- and young person-implemented behavioral sleep interventions for older children and adolescents with ASD. However, the active treatment components of such interventions have not been identified in previous studies, as components have not been evaluated independently of one another.Methods: The current study sequentially implemented FBA-informed treatment components (in the order of least to most restrictive and time intensive) within a single-case AB design, to evaluate at which point treatment resulted in a statistically and clinically substantive reduction in target sleep variables. Combined parent- and young person-implemented intervention components consisted of: (a) white noise; (b) white noise and relaxation instruction; and (c) white noise, relaxation instruction, and stimulus control.Participant: The participant was a 9-year-old girl with autism and selective mutism.Results: The combined use of white noise, relaxation instruction, and stimulus control resolved the participant's sleep problems. Other more restrictive and/or time intensive interventions were unnecessary. Treatment effects were maintained at 10-week follow-up.Conclusions: The current study illustrates the feasibility of administering FBA-informed treatment components sequentially, to ensure application of minimally sufficient interventions.