It is normal for cats to always sleep when they first arrive at a new home, because cats are relatively sensitive to changes in the environment. They will not adapt to unfamiliar environments, and may even develop stress reactions in severe cases, so cats need to sleep to slowly adapt. Generally this situation will last about a week.
Tips:
It will take some time for the cat to adapt to the new home. At this time, it is best not to frighten the cat to prevent the cat from getting used to it. If a cat has a stress reaction and is mentally depressed for a long time, it is recommended to go to a pet hospital for examination.