Many cat owners have this problem: won’t stop scratching the furniture! Such behaviour must be stopped - using food.
There could be a million reasons for the cats’ behaviour, and to find out one would need a detailed case history. However, cats may have a problem with their food or the way they are fed. Sharpening nails by scratching furniture is preparing for the hunt, which cat can’t do on the top floor of a flat. It is good to try to set up a 24/7 permanent, self service, carvery of all their favourite food. Cats will probably stop sharpening up their weapons on the furniture. Their environment should be enriched by providing them with something to do all day with their very bright and intelligent brain. Make the cats walk, hide-aways, tunnels and mobile toys. And most of all make the cats tummies full so they can get to sleep if they wish. We should remember that we can’t sleep on an empty stomach either. These will help solve the problem.