I have 2 male cats that are about 6 months old. They were both neutered on Wednesday, with no complications or problems. They are now home and just seem so listless and tired. I know it has only been 2 days, but I miss my feisty little boys. All they want to do is sleep, and one of them doesn't want to be in the room with us. This is very different from the way they were before. They were constantly playing and fighting and bugging me too death!! I have heard some say that cats really change after neutering, but what can I expect?