Research on motivational conflicts indicates that students' difficulties during studying may result from tempting alternatives in the leisure domain. In the present set of studies, we addressed the question of whether academic motivation inversely has negative spillover effects on students' leisure-related functioning, too. In the first 2 studies (N = 169 and N = 206), the self-regulatory impairment students reported after the decision for studying or socializing in a predefined study--leisure conflict was related to their general academic and social adaptation. Results provide 1st evidence for domain-specific drawbacks in students' functioning, depending on which activity is interfered in situations of motivational conflict. In a 3rd study (N = 358), we replicated these findings based on idiographic conflicts. Furthermore, motivational interference is introduced as a crucial process that may underlie such adverse effects. It is demonstrated that after the decision for a focal action, the motivational strength of foregone alternatives continues to influence students' self-regulation during both study and leisure activities. Findings are discussed with regard to the connection between study and leisure strivings, motivational conflicts, and academic motivation.