Sleep has been considered crucial for recovery, but little is known about the specific associations between the workGÇôfamily interface and sleep quality. Based on COR theory, the goal of this study is to examine the moderating role of sleep quality on the relationship between workGÇôhome interaction (i.e. negative workGÇôhome interaction, negative homeGÇôwork interaction, positive workGÇôhome interaction, and positive homeGÇôwork interaction) and psychological strain. A total of 273 ambulance workers from Spain participated in the study.