You may think the life vest under your airplane seat will save your life if the aircraft ends up in the water. In fact, such a thing has never happened in modern commercial airline flying.
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The dimming of cabin lights only happens when it is dusk, dawn or dark outside the aircraft. This is a safety measure, and is to ensure your eyes are adjusted to the gloom enough to see the floor lights leading you to safety along the aisle in the event of a crash or emergency evacuation.