Pupil size is actually not only due to light but affected by your body's endogenous drugs or outside drugs you may take, as we all know opiates will make your pupils small as a pin even at night, or whatever, while cocaine or psychedelics will make your pupils wide as a dinner plate even during the day. To say nothing of atropine and the like.

Those play off your body's natural drugs, the endogenous ones aforementioned.

Also how could you not like cats? That's weird.