Sofa bed in the purchase, should pay attention to the following points: (1) moderately soft, elastic equilibrium. When lying is not a part of any feeling the weight of the body, the body will not be set in one place, but according to the body's natural forces, dispersed in the shoulder. Each part of your hand. Foot. Buttocks, etc., can be maintained regardless of the supine or lateral bones and muscles of normal posture. (2) pay attention to whether the four corners of the sound appears. Poor quality of the spring, at the corners of the most easy to find; good quality playing time under pressure is not the sound. (3) Note that the bed surface and ground positions. The bed is too high, do not go to the effort; the bed is too low, when the impact of sleep health, because dust tends to flow from the ground height of about 30 cm. Usually high 40 cm above the bed surface is better. As for the brand, then full-friendly furniture, IKEA IKEA, Huari, dream thinking, Federal these beds has done a good sign in terms of a sofa bed should also be made to do more good, the landlord can refer to the contrast see it. If you have time, then you can go to China's top ten brand network buy purchased brand that inquiries under the bed top ten brands, multiple reference also some more choices ah. .