Methods to prevent cats from scratching the door at night:

1. The owner can take the cat out for activities during the day, or interact and play with it more to consume its energy. It will rest quietly.
2. When the cat is hungry at night, it will also scratch the door to remind the owner to feed it. The owner should prepare more food and water for the cat.
3. Prepare a few more cat scratching boards at home. If the cat has a place to sharpen its claws, it will reduce its desire to scratch the door.
4. Place a piece of grapefruit peel in front of the door. Cats will stay away from the door if they hate the smell of grapefruit peel.
5. Put double-sided tape on the door. If the cat scratches the door, its claws will be stuck, and it will stop scratching the door in the future.