First, I'll start with my own sleeping dog. He's been having storm angst for the last few days. He doesn't do well with the hail and thunder, so neither of us get a lot of sleep. Today, he's done nothing but sleep. I'm certain he's trying to catch up... maybe that works for dogs. So I'm letting my sleeping dog lie... or something...
But what does that really mean? Let sleeping dogs lie.
It means one "shouldn't disturb a situation as it would result in trouble or complications."
So, you're just supposed to sit back and hope it works itself out? Well, that doesn't seem like it would work for anything except maybe clothes that are already in the dryer.