Why haven't I thought of this? To get rid of the light that comes through the sides of your curtains, slip one of the curtain ring clips onto the rod bracket. No more side light! Also good when using thermal-backed curtains to help stop drafts.
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 :)
2 Tips on How to Hang Curtain and Drapery Like a Designer