Remove carpeting in the bedroom. Clean up surface dust as often as possible. Use a damp mop or damp cloth when you clean. Don't use aerosols or spray cleaners in the bedroom. And don't clean or vacuum the room when someone with asthma or allergies is present.
Window coverings attract dust.
Use window shades or curtains made of plastic or other washable material for easy cleaning. Closets need extra care. They should hold only needed clothing. Putting clothes in a plastic garment bag may help. Dust mites like moisture and high humidity.