Interaction between sleep duration and trouble sleeping on depressive symptoms among U.S. adults, NHANES 2015-2018

•A positive additive interaction was observed between short sleep duration and trouble sleeping on depressive symptoms.•A positive additive interaction was observed between long sleep duration and trouble sleeping on depressive symptoms.•Different sleep aspects interact synergistically, explaining a large portion of the association with depressive symptoms.•It is important to simultaneously consider multiple dimensions of sleep health in relation to depressive symptoms.