(by being tidy, that's how)
...and this is it rigged up for bedtime. The futon goes on straight onto the [i]tatami[/i] matting floor. Anyone been recommended a hard orthopaedic mattress for their back problems? Don't bother. Save the money and just sleep on the floor and during the day, kneel on it too. It will keep your back straighter than sitting in chairs ever will.