In modern time what was affected our sleep habit
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His incandescent lightbulbs brought cheap electric lighting to the masses, enabling us to extend the day. But this also changed the way we sleep. Exposure to light at night makes us more owlish, so we feel sleepy later. Light also has a direct alerting effect on the brain, meaning we find it harder to sleep.
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Mobile phone, Tv, Loud music in neighborhood. Horns of cars. etc
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