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Even modest doses of caffeine in the evening—let's say, around about 100 mg of caffeine in the evening, which would be probably a robust single cup of drip coffee—that will blunt the electrical generation of your deep sleep. And in fact, it will strip away more than 30% of that deep electrical brain wave activity in the first cycle of your sleep at
night.
Matthew Walker
100 mg of Nighttime Caffeine Blunts the Electrical Generation of Deep Sleep By 30%
#11: Sleep & Caffeine Part 2
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