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A cup of coffee in the evening can decrease the amount of that deep non-rapid eye movement sleep by somewhere between 20-40% at night. And for a spot of context, I'd have to age a healthy adult by probably about 10-15 years to produce that kind of a reduction in deep
sleep.
Matthew Walker
1 Cup of Coffee at Night Decreases Deep Sleep Quantity By 20-40%
#11: Sleep & Caffeine Part 2
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