When the kids are back in school, it means that Phil and Claire go into production mode to make sure everyone is out of the house on time. In this one-on-one aside, Phil is under the impression that both he and Claire get up at 7 in the morning to start taking care of the kids. Claire informs him that she actually starts her day as a stay at home mom at 6 in the morning. Because Claire has a comparative advantage in getting the kids ready for school in the morning, Phil gets an extra hour of sleep. In the household model of labor supply, partners often divide the tasks based on specialization, not necessarily on equitable terms.
See more: comparative advantage, division of labor, household production, household labor supply, interdependent utility functions, labor supply, specialization