Your body is built to wake naturally with the sunrise and feel sleepy as the sun sets. The light at both the beginning and end of the day is a warm, golden tone, unlike the midday bright, slightly blue sunlight that keeps you wide awake. A sunrise alarm clock mimics this transition from morning to bright daytime light, helping to signal your body to wake up (or fall asleep, if the clock also has a sunset option).
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March 26, 1953: CBS abandons their system
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