Objective: This study examined the relationships among mothers' marital satisfaction, parenting behavior, and preschoolers' sleep problems. Methods: Three hundred mothers of preschoolers completed questionnaires on three research variables. Data were analyzed by correlation analyses and regression analyses. Results: First, mothers' marital satisfaction was negatively related to preschoolers' sleep problems. Second, mothers' marital satisfaction was positively associated with warmth and reasoning, while mothers' marital satisfaction was negatively associated with intrusiveness, coercion, and neglect. Third, mothers' warmth and reasoning were negatively linked to preschoolers' sleep problems, but mothers' coercion was positively linked to preschoolers' sleep problems. Lastly, mothers' warmth partially mediated the relationship between mothers' marital satisfaction and preschoolers' sleep problems. Conclusion/Implications: This study confirmed that mothers' marital satisfaction and parenting behavior had an influence on preschoolers' sleep problems. These findings highlight the importance of the family context for preschoolers' healthy sleeping habits.