Why?

Why do mice just *have* to wait until I'm trying to sleep before they start gnawing their way into my house?
I mean, -daym, we've had so many mice here already that there should be some kind of mouse highway.
But,,,NOOOOoooo, out intrepid ratones want to make their own way to visit the mouse trap, so they want to start when people are trying to sleep.

I left the skirting open specifically so those feral cats would go after the mice.
Didn't work, they were both tearing up the underneath of my house in a co-operative effort to show how much they appreciated my $75,000 habitat for wayward critters.

I'm almost asleep (again) when they have to start gnawing in the middle of my bedroom.