The reasons why cats are listless and want to sleep:

1. Hungry. If a cat does not eat for a long time, it will lead to low blood sugar in the body and symptoms such as depression and lethargy.

2. Take a bath. If we give a cat a bath, it can easily cause psychological contrast and malnutrition in the cat, leading to depression.

3. Getting sick and catching a cold. No matter what type of creature they are, they will get sick and catch a cold. Cats will not show abnormal behavior after getting sick with a cold. They will just be drowsy, as if they haven't gotten enough sleep, and their mental state can be called zero.

4. Habits. Cats are naturally lazy in their habits. After a cat has just eaten, except when the cat is initially energetic, the cat will become inactive.

5. Pregnancy. After being pregnant, cats will appear listless every day, as if they have a cold. When they have nothing to do, they always like to lie in a quiet, warm and bright place. The number of times they sleep increases significantly.

6. Respiratory diseases. It may be caused by diseases of the respiratory tract or digestive tract.

7. Hypoglycemia. It may be caused by factors such as hypoglycemia. The body is weak and the cat feels uncomfortable and wants to sleep all the time.

8. Infection with cat plague. It may be that the cat is infected with infectious diseases such as feline distemper virus and coronavirus. The condition causes the cat to be lethargic and occasionally bark and then sleep.