Hi. I adopted 2 two month old persian kittens. Its been just over a month. They have been vaccinated. Just one booster remaining. When I got them, they were very playfull and energetic. But in the past two weeks they have become very lethargic. The male more than the female. All they do is eat and sleep. All day. They hardly ever play now. Took them to the vet and checked. He said cuz its hot (I live in Karachi Pakistan). They spend most of their time in AC. They just go to sleep outside the room. Could it be anything else wrong with them? Their diet is ok. They have plenty of water at their disposal. Please help.