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Sleep-wake regulation is established during early childhood and contributes to life-long health. The family context is critical to the development of child sleep-wake regulation. The primary aim of this systematic review was to elucidate family-level constructs (outside of bedtime parenting) that contribute to early childhood (age 0-5 years) sleep health. We identified empirical research articles that investigate these relationships through systematically searching PubMed, Web of Science, and PsycINFO databases. The transactional model of sleep-wake regulation guided the selection of family-level search terms, including socioeconomic status (SES), family structure, household chaos, marital, co-parenting, and social relationships. Sleep search terms included sleep problems, duration, timing, and variability. We searched sleep and family terms in combination with infant, toddler, or preschool developmental age …