1 of 1
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.
