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The model of time-inconsistent procrastination by O'Donoughe and Rabin shows that individuals who are not aware of their present-bias (na ve) procrastinate more than individuals who are aware of it (sophisticated) or are not present-biased (time-consistent). This paper tests this prediction. We classify participants into types using a novel measure, and require them to perform a real-e ort task on one out of three dates. We nd that sophisticated participants perform the task signi cantly later than na ve participants. Our data suggest that this result may be explained by habit formation.