Humans, who function mainly in the daylight, are diurnal. Other diurnal animals include lions, killer whales and polar bears, according to Animalia. Because cats don’t seem to fit the diurnal mold.

The studies highlighting this correlation between warming temperatures driving animals to turn nocturnal—even when it decreases their risk of survival, thanks to predatory activity—keep coming.

Even though they’re not actually nocturnal, cats certainly do a lot of snoozing during the day. But while they sleep 12 and 15 hours a day, they’re actually not lazy, or even very deep sleepers!