Not all convertible sofas are created equal. Some are sold for occasional sleeping, others for daily use. The difference ? First, the density of the mattress: below 30 kg per m3, the support is not firm enough and the back is toasting. It is also preferable that the mattress is made in one part. Sleeping on a mattress divided into three parts and which lacks support, is preparing to enrich your osteo! Finally, there are the mechanisms. Those sold for occasional bedding are not meant to be handled every day. We therefore risk seeing them give in after a year or two.