Yours just stands on you chest?
Ours not only stand on my chest, but starts slapping me awake. I think I heard the larger male say, WAKE UP YOU SLACKER, GET OFF YOUR BUTT AND HAUL IT DOWNSTAIRS, YOU THINK WE HAVE ALL DAY!!!!
Oh I can so identify with this behavior. At my house, even pulling the cover over your head is uselesss - Baxter the Black will simply paw it away - using claws - until your face is uncovered.
Our oh so earnest and charming vet has explained to me that cats learn to vocalize from humans - they recognize that we communicate with sounds and respond by using sounds themselves. Studies have show that cats have the ability to reproduce many of the sounds of the alphabet. Many cats can say "milk" - as if the whirling and prancing in front of the refrigerator door is not message enough in its self. Many cats can say "out" - not Baxter the Black, because he can turn the doorknob, so requires no vocalization. Cats do particularly well with mmmm and owww and wooow sounds. And some are good at arrrgh sounds also.