 Making your bed could be making you sick. That tightly made bed provides the perfect breeding ground for those flush-eating, allergy-causing dust mites you share your sheets with. But an unmade bed is proven to help kill them off. To ensure maximum damage, make sure to, 1. Open the windows to get sunlight directly on the bed. 2. Get air circulating. Fresh air will work with the sunlight to dehydrate the little critters. And 3. Wash your sheets more often. Every week is absolutely necessary.