1. Cats sleeping in a ball can resist the cold. The spherical sleeping position can minimize the heat dissipation area, making it easier for cats to keep warm. In the winter, cats are often seen huddled up and sleeping. ​​​​​​

2. Cats feel more secure when they curl up into a ball. This protects their fragile abdomen and is less likely to be attacked by enemies, which is good for safety, so cats like to curl up into a ball.