What do you propose? Foam-based mattresses are becoming more and more prevalent. While they can be folded more easily (and without damage) when compared to inn

What do you propose? Foam-based mattresses are becoming more and more prevalent. While they can be folded more easily (and without damage) when compared to innerspring mattresses, I can't imagine why you'd want to do that on a regular basis. The only real alternatives I can think of are camping-oriented bed-rolls and hammocks. While they can be comfortable, they're clearly compromises: given the option, long term, most would choose a bed. Humans lay flat to sleep. It's ideal to have a dedicated sleeping space. Hence, beds and bed rooms. Make sure you're not trying to use foldable beds to solve problems of being unwilling to build your buildings higher to provide sufficient space for bedrooms, or if you're already looking at a high-rise area, sufficiently speedy public transport to allow people to come in from areas that have the space.