Why Do Your Cats Look Sleepy?--Know About Lethargy in Cats Have you ever seen your cats being lethargic? And have you taken any actions on seeing it? Many people don’t think lethargy is a big deal, maybe their pets just didn’t get enough sleep. That may be the case. But lethargy is also an indicator of many health problems, especially if the lethargy of your cats lasts for days. So...