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Coffee doesn’t have to keep you awake to disrupt your sleep

Researchers found caffeine can reduce slow-wave activity, suggesting a full night in bed may still leave sleep less restorative, according to EEG tests.

Summary by Science Daily
Caffeine may make sleep less restorative even when you fall asleep normally and stay in bed for eight hours, with EEG recordings revealing fewer of the slow brain waves associated with deep sleep. Individual sensitivity varies dramatically, meaning even caffeine consumed earlier in the day could affect nighttime recovery for some people.

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Science Daily broke the news in Encinitas, United States on Tuesday, September 22, 2026.
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