This study examined the relationships among sleep problems, executive function and social behavior during the preschool period. In addition, the mediating role of executive function between sleep problems and social behavior was investigated. Methods: A total of 304 preschool children participated in this study. The data were collected through maternal reports. Results: First, preschoolers' sleep problems were found to be significantly related to overt aggression and prosocial behavior. Second, preschoolers with sleep problems displayed lower levels of executive function. Third, preschoolers' executive function was significantly associated with social behavior. Lastly, preschoolers' executive function fully mediated the relationship between sleep problems and overt aggression, and between sleep problems and prosocial behavior. That is, preschoolers' sleep problems had effects on overt aggression and prosocial behavior, only through the effects on executive function. Conclusion: This study contributes to the sleep literature by examining the role of executive function and emphasizes the importance of forming a healthy sleep habit during the preschool period.

The present study examined the influences of fathers' and mothers' work-family conflict on their warm parenting, as well as their early school-aged children's internalizing and externalizing problem behaviors. Methods: The data were drawn from the eighth wave Panel Study of Korea Children (PSKC) data. A total of 558 dual-earner parents and their first graders from elementary school (boys: 281, girls: 277) were the subjects of this study. The Actor-Partner Interdependence Model (APIM) and Structural Equation Modeling (SEM) were used for the dyadic data analysis. Results: First, significant actor effects were found between fathers' and mothers' work-family conflict and their warm parenting. Second, a significant partner effect was found between fathers' work-conflict and mothers' warm parenting. Third, fathers' work-family conflict showed a significant direct effect on children's internalizing problem behaviors. However, fathers' warm parenting was not significantly related to children's problem behaviors. Fourth, mothers' work family conflict did not show a direct effect on children's problem behaviors. However, mothers' warm parenting showed a mediating effect between mothers' work-family conflict and children's internalizing and externalizing problems. Mothers' warm parenting also mediated between fathers' work-family conflict and children's externalizing problem behaviors. Conclusion: With few extant studies that explored work-family conflict's effect on parenting and children's development, this study addressed the gap by showing interdependence between parents' work-family conflict and warm parenting and their effects on children's problem behaviors.

This study examined the pathways from mothers' childhood attachment to parents to psychological well-being. In addition, the mediating role of marital satisfaction on the relationship between childhood attachment to parents and psychological well-being was investigated. Methods: A total of 294 mothers with preschool-aged children responded to questionnaires regarding childhood attachment to parents, marital satisfaction, and psychological well-being. The data were analyzed using SEM. Results: Mothers' childhood attachment to their mothers had a direct effect on psychological wellbeing and an indirect effect on psychological well-being through marital satisfaction. That is, mothers who had secure childhood attachment to their mothers showed a high level of psychological well-being. In addition, mothers with secure childhood attachment to their mothers tended to be more satisfied with their marriage, which led to higher levels of psychological wellbeing. However, mothers' childhood attachment to their fathers did not have significant effects on either their marital satisfaction or psychological well-being. Conclusion: These findings emphasize the importance of mothers' positive relationships with their mothers and husbands in promoting psychological well-being.

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