WH, please do not thnk of this as criticism - I think your h is a real jerk. But what do you think might have happened if you had said 'I agree that we need to focus on getting the kids to bed earlier for their sake. How do you suggest we do this?

I am not saying this will work but any other approach will not because it is guaranteed to turn into a downward spiral,

What I am suggesting is called 'building behaviour' and tries to tap into the positive side rather than the negative 'we have been round and round this before' in which both parties take up positions and do not want to budge.