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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.
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.
Caffeine before falling asleep? In fact, this is an underrated secret weapon against fatigue. However, the combination of sleep and coffee only works under certain conditions.