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Caffeine Slashes Deep Sleep Waves, Fragments Rest

5/28/2026

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Story summary
  • Professor Donata Kurpas of Wroclaw Medical University says caffeine cuts slow-wave activity, making EEG resemble wakefulness.
  • EEG studies find caffeine can delay sleep onset and fragment rest while total sleep time stays unchanged.
  • Even when people feel rested, EEG shows reduced sleep markers, exposing a gap between perception and recovery.
  • Genetics, metabolism, age, stress and fatigue shape caffeine’s night persistence, making slow metabolizers prone to disruption.