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Decorative pillows
You may expect to be free of sneezing and itchy, watery eyes during the winter, but just because you're not outdoors with pollen doesn't mean you're in the clear. In fact, all the time spent indoors can make you more likely to react to the most common winter allergen: dust mites, which can be found in hoards in the decorative pillows on your bed or sofa. (The fecal matter from dust mites is what sets off allergic reactions, says Sawlani.) Plus, you're probably not throwing them in the wash regularly (if ever), something that can help kill the dust mites. "If you find that you have dust mite allergies, keep bedding to a minimum," she recommends.