Blackout curtains are fabric drapes or shades that cover windows and block out sunlight and artificial light from passing cars, streetlights, and other sources. They are designed to provide an extra layer of protection over blinds, which tend to have gaps that allow light to leak through. Blackout curtains are used to reduce exposure to morning sunlight and other light sources, which can disrupt the creation of melatonin, a naturally occurring hormone that helps regulate the bodys circadian rhythms or natural sleep-wake cycle. They can help people fall asleep faster and keep snoozing longer, especially those who suffer from sleep deprivation or a disorder like insomnia. Blackout curtains can also improve energy efficiency by helping to insulate a room, soften outside noise, and increase privacy better than other curtain types. They are ideal for bedrooms, nurseries, home theaters, or any room used for napping or resting in the middle of the day. Blackout curtains are installed in the same way as standard curtains and drapes, and they are available in a range of colors, sizes, and styles. The best blackout curtains are thick and block out 100% UV rays and natural sunlight, and they do not necessarily need to be a dark color. However, blackout curtains can make a room pitch black, which means youll have to rely on electric light sources to see, and they are heavier than other curtain types and require sturdy rods.