Studio Oink's solution for a small, high-ceilinged room is to create storage under an elevated bed platform.
teen beds with storage underneath | Drawers, Multiple Shelves and Deep Storage
Window seat/bed w storage underneath DIY Bed Frame Bed/Playroom DIY Duo Desk
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Put a bed on top and a set of steps on the side and you've hot a high rise storage palace of a bed!
IKEA DIY Ideas: 6 Ways to Make Your Own Platform Bed (with Storage!)
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