You're struggling to get through your endless errand list when you find yourself exhausted and bleary-eyed. What gives? Maybe your sweater. According to a recent study, wool attracts 10 times more allergens than other fibers. That's because wool naturally absorbs moisture from the air, making it a magnet for airborne dust allergens. To keep your woolens from making you tired, simply throw them in the dryer on a low setting for 30 minutes once a week. The tossing and heat dislodge small particles from the wool fibers, leaving your sweaters allergen-free and you with lots of energy.