There are so many kinds of mites and many are willing to bite us if their preferred meal is not available like birds for example. I am wondering if you have any openings in your attic where birds can nest or other animals can get in.
I am thinking you should try dusting everything, bedding, the rugs, couches, chairs, etc with food grade diatomaceos earth
as that should handle the mites, as well bed bugs and fleas just in case they are part of the problem. It is often sold in health food and pet stores. Go to: http://www.earthworkshealth.com/orga...st-control.php
and you will find lots of info on this product or Google food grade diatomacous earth
. I have had good results using this to stop being bitten and laying in the DE does you no harm and washes off or vacuums up easily. Good luck.
PS do not use the pool supply kind, must be food grade and do not buy the stuff they sell in the plant departments as it also has other ingredients that could harm you. Food grade can even be taken internally if you think you might be harboring intestinal parasites.