The Guardian

Key takeaways from The invisible addiction: is it time to give up caffeine?

The long read: Caffeine makes us more energetic, efficient and faster. But we have become so dependent that we need it just to get to our baseline

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the “quarter life” of caffeine is usually about 12 hours, meaning that 25% of the caffeine in a cup of coffee consumed at noon is still circulating in your brain when you go to bed at midnight. That could well be enough to completely wreck your deep sleep.

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