A cat's sleep duration generally varies depending on its age. Each cat at different ages requires a different amount of sleep, which can generally be categorized as follows:

1. Kittens (0-3 months)
Cats need a lot of sleep during this period to support their rapid growth. It can be said that during this period, they are basically sleeping every minute and every second.
2. Kittens (4 months - 2 years)
During this period, cats generally need 15-18 hours of sleep per day, and they are usually a little playful during the day.
3. Adult cats (3-10 years old)
During this period, cats only need 12-16 hours of sleep. They usually adjust their sleep habits according to their lifestyle and indoor environment.