We've all seen it in movies. A villian suffocates one of his/her victims with a pillow while they sleep, killing them in a matter if a minute or so.
Whenever I've pushed my head into a pillow as far as it will go, I can still breathe. I even asked one of my friends to pretend to smother me (very realistically) and I could still breathe through the pillow.
Is this form of suffocation a myth?