Houseplants can do more than just bring a splash of green indoors, it turns out ... especially when they're in your bedroom. A famous1989 NASA studyfound that such plants were able to reduce indoor air pollutantssuch as benzene and formaldehyde, at least in a controlled lab environment, and more recent research says plants may make you feel less stressed and more creative. That can never be a bad thing. Here are a few of the best air-purifying plants to consider keeping in your bedroom at home.