I live in Japan, where a lot of people live in spaces that small (and smaller). My wife and I did too (before having kids though) and what is common in Japan is these expandable bars that you can put up between any two strong walls.
In our case, we put one up over the middle of our bed, and hung all our clothes on it (even hanging-optional stuff like T-shirts). You had to kind of tunnel through it when getting into bed, but this let us make use of the otherwise useless airspace over our bed. It also formed a kind of soft wall or curtain that made the area where your head was darker than the rest of the main room. That was handy when one person wanted to sleep and the other was still working.
In our case, we put one up over the middle of our bed, and hung all our clothes on it (even hanging-optional stuff like T-shirts). You had to kind of tunnel through it when getting into bed, but this let us make use of the otherwise useless airspace over our bed. It also formed a kind of soft wall or curtain that made the area where your head was darker than the rest of the main room. That was handy when one person wanted to sleep and the other was still working.