Do cats try to take your breath away on purpose?

I had heard about cats taking people’s breath away while they sleep and killing them. I didn’t really believe it until one night i had fell asleep on my back, which i don’t do often. i thought i was dreaming that my breath was being snatched away until i realized that i really couldn’t breath. I woke up to find my cat sitting on my chest looking extremely peaceful….should that worry me?