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Caffeine Found to Disrupt Internal Clock, Sleep Patterns

Researchers have discovered that caffeine can delay normal sleep times by as much as 40 minutes, if consumed three hours before anticipated bedtime. The amount of caffeine associated with sleep disruption was equivalent to what is typically in two shots of espresso. Kenneth Wright, head of the Sleep and Chronobiology Laboratory at the University of Colorado in Boulder, said some coffee shop brews typically contain more caffeine than that. Scientists have known for a long time...

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