Many cat foods are basically just water . Read the nutritional info , often it will say over 80 per cent water . Strangely I've noticed that it seems to be the more expensive ones that contain most water . Cats need lots of water so that in itself isn't a bad thing , but it does mean that a lot of cats are just not easily satisfied with the cat food and so you need to give them plenty of it . Also I've noticed with my own cat , he doesn't sleep well unless his tummy is full . So if he suddenly wakes up and starts fussing me , he's asking for food so that he can go back to sleep . Try a cat food that seems to be substantial . My cat likes Felix original , it seems to fill him , for a while anyway , I have to mash it so there aren't any lumps in it though . Many cat foods are all jelly or all gravy , cats like those but they don't necessarily fill them .