You should be sleeping in total darkness, and this curtain rod which is definitely not an item from The Legend of Zelda can help.

As companies like Umbra are wont to do, the Twilight Rod is an exercise in designing something the way it should have been designed to be begin with. The rod curves toward the walls at its ends, allowing the curtains to sit flush against the wall and thus stopping most or hopefully all light bleed. It’s also extremely easy to install.