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If you have a cup of coffee at 2 PM, it would be the equivalent of getting into bed at midnight, and just before you turn the lights out, you swig a quarter of a cup of coffee and you hope for a good night of sleep. And it tends not to
happen.
Matthew Walker
Caffeine's Half-Life Is 5-6 Hours; Its Quarter-Life Is 10-12 Hours
#10: Sleep & Caffeine Part 1
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