Read something simple and fun after kids go to bed while you're staring into the abyss before you go to bed.

Science fiction and fantasy work well. The Dungeon Crawler Carl books really help my brain take a break without actively disengaging the actual thinking parts.

> while you're staring into the abyss before you go to bed

I feel like I'm doing it wrong (or maybe right?), but I don't have that time. I'm asleep a minute after I lay down. In fact it's been an issue because the kids sometimes want me to lay down with them to fall asleep, and then I fall asleep in their bed!