Rocha Fernandes Furniture, 2018-01-07 02:44:05. Students in small dorm rooms can opt for a twin mattress size (or twin XL). A twin (or "single") mattress is great for day beds and bunk beds, as well as guest rooms! Many twin mattress size buyers are looking for their childrens needs - it is simply perfect for a childs bedroom. This will give the child enough room to sleep for years, maximizing bedroom space and making room for toys, a desk, a dresser and more. It will be quite some time before he or she will need a full or queen size mattress! Has your old mattress seen its better days? If so, there is no better time to consider the purchase of an organic mattress. They are available in all standard sizes including crib; twin extra long and California King. Initially, you might think that a natural mattress is out of your price range. However, it shouldnt take long for you to realize that the overall benefits that these sleep surfaces provide are well worth the extra expense. An organic mattress typically lasts two to three times longer than a conventional one. Many have a life span of more than 20 years. This fact, alone, represents a huge savings. Synthetic mattresses emit dangerous fumes, on a continuous basis, which are especially harmful to children. Organic mattresses do not present this problem.