|  No matter how clean the home, all soft furnishings are prone to the same problem.
As we walk, sit or just sleep we are continually shedding skin cells. A person with normal skin will shed around 500,000 skins cells a day, a person suffering from eczema, psoriasis or dry skin can shed twice that, this then exacerbates the problem by providing the dust more of its food source. The skin that we shed often becomes infested with a fungus called Aspergillus repens which takes out the fat and adds water, thereby making our shed skin perfect for the dust mite's nutritional needs. The mite excretes and re-ingests the faecal pellets containing skin cells to extract all the nutrients. This can happen over 6 times before all the nutrients are extracted.  In the meantime, the level of faecal pellets containing dust mite allergens builds in the dust all around our homes. Dust mites can generate up to 4 times their own body weight in faecal pallets every day. Our mattresses is a hot spot for dust mites.
When we sleep, we produce up to half a litre of sweat every night & shed about a gram of skin each day and although we wear night clothes, which we wash regularly, together with our bed linen, this is no protection against what happens to the mattress. 
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