What would you do with this awkward nook?

I have a very large master bedroom (20x25) but I have this awkward corner with windows that I can't figure out what to do with. Currently we have the bed with the headboard against the wall on the right side of the photo. We could move it elsewhere in the room, but this is the nicest location for privacy reasons.
I considered building in a window seat, but it is just too small. The space is only about 3 feet wide. I am even struggling to figure out a window treatment since the edge of the window is right against the closet wall. I also considered ripping out the closet and eliminating the niche, but there isn't really a place to put in a new closet.
Any ideas?
q what would you do with this awkward nook, bedroom ideas, home decor, What can I do with that corner
What can I do with that corner?
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