Mom's want rest, Father's want to work more efficiently so it is easier to get work done.
I shall now proceed to for no reason at all explain why the fathers are smarter in this respect
It is actually quite sensible when you think about it, If your work is easier, you spend less time on work, and get more rest, then as the years go by you get more and more rest while your work is easier than before, mother work, work, work, work then they want rest instead of things that will make the job easier granting them rest :p
Fathers work work work and then try to improve work performance and efficiency so they earn more rest, more money and a better life.