I've read in a few places - credible places ala Scientific American, not your average Horoscope Delight shit - that our heads are full of mites feeding off the juices coming out of its skin. These mites live long and prosper in our pillows and our mattresses, and in fact they are so prolific that each year our pillows add some 10% to their weight in the form of mite shit. Those mites are not exactly healthy: researchers are beginning to suspect they're to blame for all sorts of illnesses that attract us.
Think about it the next time you lie in a hotel bed, mixing yourself with shit from peoples' heads all over the world.
With that in mind, we have replaced the pillow I have been using since high school this week with a new one. The old one was thrown to the garbage, rather unceremoniously.