Americans slept more and worked less last year, reflecting an economy that remains groggy after the recession and an older population with more time to rest.

Averaging together both weekdays and weekends, Americans older than 14 slept for eight hours, 44 minutes and conducted work-related activities for three hours, 28 minutes each day, according to the Labor Department's annual American Time Use Survey, released Wednesday. That is 14 minutes less work a day and 10 minutes more sleep than when the survey began a decade earlier,...