Time Use and Productivity: The Wage Returns to Sleep

We investigate the productivity effects of the single largest use of time - sleep. Using time use diaries from the United States, we demonstrate that later sunset time reduces worker sleep and wages. Sunset time one hour later decreases short-run wages by 0.5% and long-run wages by 4.5%. After investigating this relationship and ruling out alternative hypotheses, we implement an instrumental variables specification that provides the first causal estimates of the impact of sleep on wages. A one-hour increase in average weekly sleep increases wages by 1.5% in the short run and by 4.9% in the long run.