This is a perfect combo of my two favorite ideas for that space under the stairs leading to the basement. A reading nook AND book storage and shelves . assuming that there is enough space for this there.
Punch out panels in a room divider and fill with light strewn branches tangled in strings of lights for a fairytale-like forest in your home. Photo: Comfy Home Decor Would make a nice light in almost any room.
Hang a curtain rod draped with sheer curtains (or fabric) at headboard height, behind the bed, then add some white holiday lights behind the fabric and across the rod.--- maybe just a string of lights over the headboard :)