Why does your cat yawn every time it sees you or hears your voice?

Cats are nocternal and sleep most of the day and race around at night. Usually your pet will play during the day and then have a nap. They feel loved and confident so when you come over to them and speak to them they know more of what you're saying than humans give them credit for. They know you love them and it's their way of showing affection. My cat talks back to me by chirping, rubbing against my arm or leg and rolling her eyes and yes, I get the occasion yawn.