There is quite a bit you can do to reduce your exposure to dust mites....
You can buy these mattress, pillow and quilt protectors that you zip around them to prevent the dust mites getting in. Also vacuuming your mattress and spraying soft furnishings with anti dist mite spray can help. I am told you need to wash things at a highish temperature in order to kill dust mites too.
I removed the carpet from my bedroom recently and even though it was vacuumed regularly and had been professionally cleaned not long ago, it was still bogging!
