Use fiberfill pillows that are hypoallergenic. Wash pillows or at least put them through the dry cycle to remove dust and allergens. Wash curtains regularly. Use a dehumidifier or adjust the air-conditioning system to keep home humidity at 50 percent or less. Use high-efficiency filters and change them regularly.
Vacuum carpets every few days.
This may remove some of the dead mites and their droppings, but the live mites will cling to their surroundings. An inefficient vacuum cleaner can make the problem worse by drawing dead mites and their fecal matter out of the carpet and blowing them into the air. Have carpets steam cleaned or chemically cleaned on a regular basis. Consider hardwood floors, tile or other smooth surface flooring instead of carpet. Hanging carpet outdoors in the hot sun will help kill dust mites.