Dust mites are literally everywhere, so logically, making your bed at night won't do much to reduce their number in your home. In addition, waiting to make your bed until after you've eaten breakfast may help to avoid bringing any allergens and other impurities into your bedding, which could aggravate asthma or other respiratory problems. However, if dust mites are really bothering you and you can't seem to get rid of them, it's always worth trying an anti-dustmite treatment like a vacuum cleaner with a HEPA filter attachment or a professional duster.