Idea blackout window curtains are that they prevent light from penetrating the room. They are usually hung behind a curtain of plain fabrics and can be withdrawn at night so that no light enters the room in the morning. During the day, they can open from behind the curtain of normal fabric so you still have privacy but the light did not enter the room. Despite the heavy blackout curtains over the window drapery average they are soft enough to hang naturally.
In addition, blackout window curtains are preferred as they also protect against extreme cold and heat that will go a long way in reducing your energy bills. You will probably find blackout blinds is very useful if you have a baby you do not want to wake up at dawn, or if you are a night shift workers or students interesting study sessions late at night and wanted to sleep late in the morning. Hotel using blackout curtains to morning light in the living room so that guests are not woken up early.
Blackout window curtains can block the light because they are generally made of heavy fabric and tightly woven. Most brands claim that their curtains will block as much as 99 percent of the daytime. You can usually find blackout window blinds in a variety of colors even though their names are given which show the picture that they only come in black.