You rest your head on one almost every night (excepting those instances where you wake up in a daze on bloodied tile/pavement with a racketeer's jawbone in your vest pocket). It is a place of warmth, comfort and security.
But Up Close ...
You couldn't be more wrong. This is your bedroom pillow this very second:
Those are common house dust mites. There's about a bajillion of these micro horrors living inside your pillow as we speak. We couldn't find a source saying that they crawl all over your face and into your ears and nose while you sleep, but really, do you trust them not to? They graze on your pillow like bloated alien cattle and feed off of your dead skin cells (and presumably your terror-soaked nightmares as well).