Caffeine significantly impairs the electrical quality of deep non-REM sleep, reducing it by 20% to 40% even in individuals who do not struggle to fall asleep. Consuming just 100 milligrams of caffeine in the evening can strip away over 30% of deep brainwave activity during the first sleep cycle, effectively aging an adult's sleep profile by 10 to 15 years. This deficit often triggers a dependency cycle where unrefreshed individuals consume more caffeine the following day, further eroding sleep quality. Despite these risks, coffee offers substantial health benefits primarily through its high antioxidant content—including cafestol and soluble fiber—rather than the caffeine itself. Because coffee serves as the leading source of antioxidants in the standard Western diet, decaffeinated versions provide similar health virtues without the associated sleep disruption. Optimal consumption involves limiting intake to one to three cups daily and maintaining a strict 12-hour caffeine-free window before bedtime.
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