A small U.S. study suggests sleep problems in younger children may be associated with higher conflict between students and teachers, according to Business Insider.

The role of sleep problems in children with behavior problems at school has long been explored, and many youngsters who come to doctors for sleep evaluation do so at the urging of a teacher or counselor, said Dr. Shalini Paruthi of the St. Luke’s Sleep Medicine and Research Center in Chesterfield, Missouri, who was not involved in the study.

But “the idea that sleep also impacts the student-teacher relationship is a new and intriguing concept,” she said in an email. The current study, conducted in a primary school in the midwestern U.S., showed a statistically significant association with student-teacher conflict in younger, but not older, children.