There are lots of reasons for buying a new mattress(床垫): getting married，moving to a new home or simply the desire for more sleeping space. No matter what the reason，the ultimate expectation is a good，restful night's sleep. But with all the different constructions，firmness，sizes and prices for sleep sets，how do you decide which one is right for you? The makers suggest you treat bedding as a long-term investment. This means carefully considering the quality and comfort you are getting for your money. If you've decided to buy a new mattress，invest in the very best you can afford. Prices are determined by the material used，the quality of construction and the size of the set. It's an investment in one-third of everyday of your life and that can have a dramatic effect on how you feel the other two-thirds.