Time spent working or caring for children may reduce the time available for undertaking time-intensive health behaviors. We test competing perspectives about how work hours and the number of children of specific ages will be associated with married or cohabiting men’s and women’s sleep duration and physical activity. We use data from the 2004 to 2017 waves of the National Health Interview Survey (N = 154,580). In support of the “time availability” perspective, longer work hours and children of any age are associated with shorter sleep hours. However, in support of the “time deepening” perspective, additional hours of work beyond 40 hours per week and children over the age of five are not associated with reduced physical activity. Contrary to our expectations, we did not find gender differences in support of our theories. Our results suggest that the economy of time works differently for sleep and exercise.
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