“…The repetitive restricted behavior (RRB) compasses a wide range of symptoms, including repetitive language, movements, and use of objects, adherence to nonfunctional routines and rituals, restricted interests, and sensory seeking behaviors, sensitivities, and sensory aversions [1]. RRB is associated with increased sleep problems, such as bedtime resistance and insomnia [5], as well as short sleep duration [17,23]. Research examining subcategories of repetitive behavior in ASD found repetitive sensory motor (RSM) behavior (repetitive use of objects, complex motor mannerisms, and sensory seeking behaviors) predicted parent-reported sleep problems, even after controlling for anxiety symptoms, whereas insistence on sameness (IS) was not significantly associated with sleep problems [24].…”