Use sheets, pillowcases, mattress pads, and bedspreads made of 100 percent washable cotton or cotton flannel, free of chemical finishes. Buy special non-allergenic pillows, or those filled with Dacron or polyester, not kapok, down or feathers. Consider using de-mite when laundering your bedding. Air bedclothes outside in sunny weather. Keep pets away from pillows or anything else that comes into close contact with your nose and mouth.
Books are notorious dust catchers.
Keep them in glass enclosed cases. Store your clothing in clean closets. Shut the bedroom door when you leave. Avoid undue fatigue, emotional upsets, or any kind of stress. These may weaken the immune system to the point of triggering an allergic attack.