I am on the hunt for that elusive of beasts, the comfy sofa bed. My sil and family come to stay several times a year and stay for a long weekend. We have a spare room for the grown ups but currently my niece bunks in with my son on a file out chair bed. I suspect we won't be able to do this for much longer as they're both growing up. I would like to get a double sofa bed for the back lounge to give us options. Ideally one which would also work for adults in future. In my experience they are usually very uncomfortable. The chair bed works for a child for a night or two but I want something more durable. Any ideas?