Cats are indeed nocturnal animals. They are accustomed to hunting prey at dusk and evening, so they are typical nocturnal animals.

A cat’s eyes are a standard nocturnal animal configuration. The eyeballs are tubular and the retina of the eye is extremely rich in columnar cells.

Cats can sense light signals from the outside world, helping cats hunt effectively in the weak light at night.

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Cats in nature are indeed nocturnal. They usually hunt at night and sleep on their stomachs during the day. This is their habit. But now domestic cats are slightly different, because people regard them as pets, and feed them three meals a day with the same rest time as humans. Over time, cats naturally become accustomed to being active during the day and sleeping at night.