We are saving to move to a bigger house but at the moment we're in a 2 bedroom house with a 5 year old and a 7 month old..... this is the solution we came up with for the bedroom.
Just sharing as when I as looking for inspiration there wasn't a lot out there - we built a basic fixed wall but left space at the top for the natural light to come in from the single window. The wall was thinner than using kallax shelving which seems a common fix but would have taken more space than we wanted to use.