In Kessler RC, Berglund PA, Coulouvrat C, et al. Insomnia and the performance of US workers: results from the America Insomnia Survey. SLEEP 2011;34(9):1161–1171 there was an inaccuracy in the annual lost productivity in the US due to insomnia-related lost work performance. In the paper, on page 1168, left column, third full paragraph, the authors stated the annual estimated cost at $59.8 billion, which came from a preliminary model. The final model cost estimate was $63.2 billion annually, which the authors failed to update in the final revision of the manuscript that was published. Other sections of the paper used the correct $63.2 billion estimate.
The authors regret this error.