Question: Best way to handle dad burnout when spouse works nights?

So my wife works 6pm-6am shifts as a nurse and I'm basically solo parenting our 3yo and 5yo for most of the week. It's great in a lot of ways but by day 3 I'm absolutely fried. The kids are fine, the house is fine, but I'm running on fumes and coffee. Anyone else dealing with this setup? How do you actually rest when you can't just "take a break"? Not looking for hustle culture answers, just real talk about what actually works.