A recent study using EEG found that caffeine consumption reduces the depth of slow‑wave sleep, the brain’s restorative phase, even when people still sleep the same number of hours. The researchers measured electrical activity in the brain and observed less slow‑wave activity after caffeine intake. The reduction occurs despite no obvious change in how long people stay asleep or how often they wake.
This suggests that people who drink coffee, especially late in the day, might not feel as rested even if they think they’re getting enough sleep. The effect varies among individuals and depends on dose, timing, and metabolism, so the findings don’t apply uniformly. Those who rely on caffeine for alertness should consider how it might affect the quality of their overnight recovery.
more: https://www.sciencedaily.com/releases/2026/09/260922005719.htm
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