We should first check whether the sofa bed moderately soft , elastic equilibrium , if you can lie on top to taste . Whether supine or lateral , can keep bones and muscles of normal posture , so that only the most comfortable sofa bed . & Nbsp; & nbsp; & nbsp; & nbsp; Note that the sound whether the four corners appear . If you use poor quality spring , sofa bed Chuangjiao most easily found quality problems , because there will not be a good spring pressure encountered sound . Note that the height of the bed , go to bed too inconvenient, too low affect human health , because the local ground at a distance of about 30 cm , most dust aggregation . & Nbsp; & nbsp; & nbsp; & nbsp; cleaning and maintenance. Weekdays shall from time to time with a hair brush to remove dust or dust concentrate then vacuumed , do not flap forcibly , to avoid unnecessary weight load , so as to prolong the life of the sofa bed . & Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp;