Image above: This room was originally used as a photography studio and was built in It is a wonderful bedroom to dream in with soft north facing light. The challenge to find find curtains was met by utilizing large cotton painters drop cloths.
I wrote a whole post about swapping your bookcases for wall-mounted shelving. Wall-mounted shelving takes up less space, and can almost appear to blend in with the wall. Image from Stadshem, via Freshhome.
TINY HOME Glass panels - a very practical idea to separate the bedroom from the living space, but also to allow light to penetrate all around the house, as this arrangement demonstrates a studio of 39 m² in Sweden.