here's one to help you get comfortably through the night:
after two years, 20% of a pillow's weight is made up of dust mites and dust mite droppings.
ew. ew ew ew ew ew.
Laurel, intrepid field agent and ersatz Canadian, has tracked down this article from New Scientist which reveals that some dude named Ashley and his team found
mini fungal "ecosystems" inhabiting five feather and five synthetic pillows that had been lain on for between 18 months and 20 years. Each contained up to a million spores from around 16 different species of fungi.