Shift work sucks big time any time I think but it's just one of those things you have to roll with and work around (unless he's up for a new job?) does he get much time off? like is it a week here then a day off there?? can you sleep in on those days?

Perhaps you need to change it up a little make it different so it's not such a task/chore each day.

Example: when my DH did night shift he would make the evening meal around 3pm so he could take some that night. This way I got a break from cooking, he got a good meal at work and DS1 had his dinner ready also. I would also lay out clothes, prepare snacks, get breakfast stuff ready the night before. ahh not sure what else......would often walk around mid arvo with the kids, stop by the park then by the time I got home it was tea/bath/bed.....relax. I've done a lot of walking I have always bathed/showered often with my kids.....makes it more fun and passes the time.

If he is watching the kids mid morning/afternoon can you sneak a nap in when you need it during the day?

Don't know if any of that helps, but yeah it's no fun Hope it gets better.