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People were told to black out their windows so no light could shimmer out and prevent them from being attacked. There was also a ban on street lights.
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The film industry uses black out curtains to shoot scenes reflecting the night.
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Most celebrities use blacked out or tinted windows to hide from the paprazzi or have some privacy.
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If you work night shifts then falling asleep during the day can become difficult. One of the main selling points is you can block out lights.
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If you don't want your children to wake up earlier than usual when it is bright outside, then blacked out windows are the best way to prevent it.
