Here is an enlarged photo of a dust mite - there are hundreds in your bedding:
A scanning electron micrograph of a female dust mite
House dust mites, due to their very small size and translucent bodies, are barely visible to the unaided eye.[5] A typical house dust mite measures 0.2–
Here is a photo of their droppings:
House dust mites (Dermatophagoides pteronyssinus). Dust mite faecal pellets that can be small as µm 10 (0.01 mm).
https://en.wikipedia.org/wiki/House_dust_mite
So, after a year, there would be lots of dust mites & lots of their droppings in your bedding.
A scanning electron micrograph of a female dust mite
House dust mites, due to their very small size and translucent bodies, are barely visible to the unaided eye.[5] A typical house dust mite measures 0.2–
Here is a photo of their droppings:
House dust mites (Dermatophagoides pteronyssinus). Dust mite faecal pellets that can be small as µm 10 (0.01 mm).
https://en.wikipedia.org/wiki/House_dust_mite
So, after a year, there would be lots of dust mites & lots of their droppings in your bedding.