AI Insight
Caffeine can reduce sleep quality even when individuals fall asleep normally and get a full eight hours of rest. EEG recordings show that caffeine consumption decreases slow brain waves associated with deep, restorative sleep. The effect varies significantly between individuals, with some people experiencing disrupted sleep recovery from caffeine consumed much earlier in the day.
Why it matters
This finding suggests that people may be experiencing poor sleep quality without realizing it, even when they appear to sleep through the night. Understanding individual caffeine sensitivity could help optimize sleep hygiene and daily caffeine consumption timing for better health outcomes.
Understand the Science
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.
Source: Coffee doesn’t have to keep you awake to disrupt your sleep