Cats always biting their feet when sleeping at night may be caused by boredom or changing teeth. Cats are very curious and have strong night vision. If the owners move their feet while sleeping, the cats will treat them as prey and bite them. They should be stopped in time to avoid If the cat forms a habit, or you can place the cat in another room before going to bed, you can also prepare teething sticks, toys, etc. to divert the cat's attention.