Young children are nature's way of telling us just how little sleep you can get and survive (retaining sanity is optional). Teens are nature's way of telling you you didn't really need to go to be early and early to rise is vastly overrated. Becomes even more interesting when they start driving and dating.

All the suggestions about developing proper sleep habits, making time for each other, and the usefulness of trailers are good. It'll come down to the lifestyle you, your wife, and family want and develop. If cycling is important enough, you will find a way to make it fit.