The more I have planned for the boys in a given day, the higher the likelihood that at least one will sleep in late.
corollary one: The boy for whom I had planned the most one-on-one work will be the one who sleeps in.
corollary two: The more non-school-related stuff I planned to do for myself after school is done for the day, the later the child will sleep in.
corollary three: As pertains to Jen's First Law, it turns out that resistance is NOT futile.