Electroencephalographic correlates of sleepiness: A meta-analysis and narrative review.
Sleep MedJul 28, 2026 (epub)
Tabitha Poethke, Kurt Lushington, Alex Chatburn
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In 30 seconds
This meta-analysis and narrative review examined the relationship between EEG power and excessive daytime sleepiness across various conditions. It found that increases in EEG theta power correlate with increased subjective sleepiness in both normal and sleep deprivation conditions, while EEG delta power correlates only during sleep loss. EEG alpha power showed no correlation.
Key findings
- Increased EEG theta power correlates with increased subjective sleepiness in normal and sleep loss conditions.
- EEG delta power correlates with subjective sleepiness only during sleep loss.
- EEG alpha power shows no correlation with subjective sleepiness in either condition.
- Novel EEG markers like microstates and event-related potentials were identified.
Why it matters
Understanding the EEG correlates of sleepiness can enhance diagnostic accuracy and treatment strategies for excessive daytime sleepiness, a prevalent issue affecting many individuals' daily functioning.