Is it the full light outside at night that they see through a window or is it just an anomaly?
The moon affects everything - - the tides, critters, people. We’re made of mostly water so it makes sense we’d be affected by the same gravitational pull as the oceans. Some poo-poo it but even more know it’s real.
Now why it makes the kittehs go wild and crazy, who knows? But we can tell when there’s a full moon without even looking. LOL! And the new moon is just as bad.
I just tuck myself into the corner where the desk is and stay out of their way. Safer that way. :-)