From Kristina Held, principle at Grun-Sustainable Architecture and assistant professor at the Art Institute of Charlotte: YES: 1. Invest in a hypoallergenic mattress. They're covered with material that lets air in but won't allow microscopic animal hair or dandruff to get through. 2. If you use wallpaper- choose a pattern that incorporates horizontal lines, which tend to settle you and make you calmer. 3. Layer your lights. It's good to have one overall light so you can see, then some accent lights that are task oriented, like a reading lamp. 4. Keep an air purifier or humidifier in your room. There are machines that do both, and sometimes they make white noise, which experts say is good because it covers sounds that could threaten your sleep. NO: 1. Avoid sleeping with your pet. It's dangerous, and the hair can make you sick and accumulate in your lungs. Be sure to wash your bedding every two weeks. 2. Don't paint your room red, as it can make...