Sometimes furniture and mattresses can be treated. Most mattresses can be saved if they are treated and properly fitted with bedbug safe covers. But when the bed bug infestation is severe getting rid of mattresses and infested furniture can be the best option. Bed bugs don't remain on beds during the day. They hide on cracks and crevices around the room so be sure whoever treats for you, does a thorough job finding all of the hiding spots. This can take a long time and can be expensive. Call around and ask a lot of questions to find an affordable knowledgeable company. Many companies offer steam treatments. Not only are they effective but they eliminate concerns about pesticides. Here's an article with pictures of what to look for and tips on preventing spreading and keeping the bugs from reaching the bed at night.