Let me count the ways I love these curtains. Look, they're not cheap, but I have never been so satisfied with a decor investment. Not only are they pretty and soft, but they are so heavily lined that they block both the light and sound outside my windows. Hanging curtains seriously lowered the volume of my crazy New York City neighborhood.
Get a panel from Bed, Bath, and Beyond for $54.99+ (available in four sizes and six colors). Or find more highly rated blackout curtains from Amazon for $23.45 (available in five sizes and 19 colors) that'll work just as well.