Create Some Darkness
Sometimes a really dark room is required and desired, particularly in bedrooms and living rooms. The quality of your sleep can be impacted by light and so the darker the room, the more soundly you will rest.
For complete enjoyment of a cinema effect when watching movies, the darker the room the better. Light can reflect off the screen and interrupt your viewing quality. There is also nothing like the ambiance of a dark room for a movie.
Blockout curtains are a great solution for both of these issues, with the added bonus of adding beautifully to your interior style, reducing noise and providing insulation to your home.