Oh cat, there is nothing easy about working full-time and being a single Mother. I had a hard time holding it together after ex decided to fly and my kids were older, so I don't envy you.
I'm sure you're right in your suspicions about Husbands interest in having the kids for an extra night. Wait until he actually has to get them where they need to be a couple of times. Let's just see how he feels about it then. Generally these selfish men don't like having to go too far out of their way even if it is for their kids.
I didn't mean to say that you were crazy, although we're all a little crazy while we're going through this, but somehow we have to be the ones to minimize the craziness. Believe me, your husband won't do that for you. What you said about your H not knowing sons schedule well that's no big surprise. Besides the fact that they all seem so confused about so many things that should be no brainers, he probably didn't waste anytime even tryong to remember, you probably always did it for him. You sound like a very hands on Mom. That's great for the kids but it only serves to make these self centered spouses even less accountable. I know. I raised one as well.