A comprehensive review of studies on parents’ work schedules and child development spanning the last three decades shows that parents’ work schedules in evenings, nights and weekends, so called “nonstandard work schedules” or “unsociable work hours”, may have negative consequences for children. When parents work such hours, children tended to have more behavioral problems, poorer cognitive ability, and were more likely to be overweight or obese than children in families where parents mostly worked during the daytime hours and week day.