Then continue stressing your neck and spine sleeping regularly on your sofa which isn't designed to support your whole body like a good mattress would and then expect constant neck and waist pains but remember also that, your sofa fabric might not be breathable with good heat absorbing texture so expect intense body heat transferred to your sofa and smelly cushions that is if you even remember you don't have cushion covers that can be washed after lying down hence, let me ask you again, Is it re