The most common species found in your pillow is Aspergillus Fumigatus.
Your pillow has all kinds of germs in it.
Researchers have found that pillows have "several thousand spores of fungus per gram of used pillow - more than a million spores per pillow."
Professor Ashley Woodcock said, "We know that pillows are inhabited by the house dust mite which eats fungi, and one theory is that the fungi are in turn using the house dust mites’ feces as a major source of nitrogen and nutrition (along with human skin scales). There could therefore be a ‘miniature ecosystem’ at work inside our pillows.” Here is the link: Link
Changing your pillow case doesn't help. The mites' feces are much smaller than the thread from your pillow case so it is in your pillow itself.
Have a good night sleep.
