Much of your time at home is probably spent in your bedroom, so it’s especially important to allergy-proof this room. Although too tiny to see, dust mites are powerful pests. They thrive in beds and their waste products cause allergic symptoms for many people. You can start by encasing your pillows, mattress and box spring (if you have one) in dust mite-proof covers. Make sure to wash all bedding weekly in 130 degree water.