Objective: Sleep insufficiency is a common public health problem associated with various psychological and physical health outcomes. A recently proposed cause for sleep insufficiency is bedtime procrastination. Despite existing research about the concept, its underlying factors are mostly unclear. Considering the theoretical analogy between sleep time and the end of the day, the current study presents an explanation for bedtime procrastination. This study aims to examine the effect of future time perspective on bedtime procrastination and test the mediator role of purpose in life in this association.