Why does my cat yawn when it sees me? If your cat yawns when seeing you, it may be an attempt to communicate; cats yawning show a contented and relaxed mood to other cats. Other reasons for a cat yawning include: Staying alert – some believe cats “restart” a sleepy brain through yawning. Taking in more air Alleviating boredom Yawns are contagious – if you see someone yawning, you’re likely to do the same. Studies show human yawns are contagious for dogs, but no studies have been done on cats thus far.