I liked HP's ideas if you feel your H will live up to the conditions / in put you two agree on. Along with HP's timeframes, if you agree on something and there are no rewards for meeting the agreement or no consequences for not meeting the agreement, agreements do not mean a thing. So, its time frame, rewards, consequences and what ever an intelligent woman like you knows will work with your H.
--------- How about you giving your input in terms of the "then what" part. That is, you could sit down together and decide what is a reasonable amount of time to give the new job a shot and nail down a few specifics, as they pertain to your family. Such as: Time frame (how long will he stay at the job before you two sit down and assess how it's going); hours worked (how long will he work long hours before you two sit down and assess what needs to be done), ETC ------------
Sleeping on the sofa? Boy I hope you guys fix that soon.