Cats may curl up when sleeping because this sleeping position is more comfortable and secure, or the cat feels cold. The specific reason needs to be judged based on the actual situation of the cat. If the cat is in a cold environment, If you curl yourself up to sleep and shiver, it means it is cold. You need to pay attention to keeping the cat warm to prevent the cat from catching a cold. If the cat usually likes to sleep like this, then it may be a sleeping habit, so don’t worry.