Dust mites are tiny critters that feed on flakes of skin and are notorious for causing allergic reactions in some people. These little bugs congregate in bed linens, especially pillows. To keep these pests at bay, wash and dry your pillows as frequently as possible, and replace them every year or two. And don't neglect your duvet covers and comforters. They need a good scrub just as often to ensure that you have a clean and serene place to catch some Z's.