Parents of young children with type 1 diabetes (T1D) may experience poor sleep quality, possibly impacting their confidence in T1D management. This study investigated sleep characteristics among parents of children with T1D and relationships among parents' sleep quality, hypoglycemia worry, and diabetes self-efficacy. As part of baseline assessment for a randomized clinical trial (RCT) to promote parental management of T1D, 134 parents of children ≤ age 6 reported on demographics, parent sleep characteristics, hypoglycemia worry, and diabetes self-efficacy. Parents reported they slept less time than recommended by the National Sleep Foundation and endorsed greater global sleep problems than standardized norms of healthy adults; one third of parents reported their overall sleep quality was "fairly bad" or "very bad." Hypoglycemia worry and parents' sleep quality were both significantly related to diabetes self-efficacy, but parents' sleep quality did not mediate the relationship of hypoglycemia worry and diabetes self-efficacy. Many parents experience disrupted sleep that impacts their perceived ability to perform T1D management. Interventions designed to improve parental T1D self-efficacy should consider sleep and concerns about children's hypoglycemia.