Why do cats always sleep?

Until now, cats still keep the habit of not sleeping during the day and going out at night, just like carnivores. Cats have many activities (such as hunting, courtship and mating). ) at night, and the most frequent activities are dawn and evening every day. During the day, cats always sleep lazily, so we often say "lazy cats". Cats sleep about 16 hours a day, which is of course influenced by age, climate and estrus. It is about 1 times that of human sleep. Cats don't sleep like people, and they don't concentrate on sleeping like people; But sleep in stages, each time 1 hour or so. Cats are very careful about the choice of sleeping places, and can accurately find a ventilated and cool place in summer. In winter, we will change several warm places with the movement of the sun. Try to be comfortable, and then snore carefree. Cats sleep in deep sleep and shallow sleep. According to research, cats alternate between deep sleep and light sleep, with each deep sleep lasting about 6-7 minutes and then light sleep lasting 20-30 minutes. Therefore, in a day, the cat's deep sleep only accounts for about 1/4, which is about 4 hours. This feature shows the alertness of a cat. If it finds anything around it, it will wake up immediately.