A linear three-session model did not establish a sleepiness link with the closed-eye 7–13 Hz spectral maximum in 56 adults

We tested frequency and reported sleepiness within 56 adults in OpenNeuro ds004148 version 1.0.1. Each person had three EEG sessions. A linear model had person terms and session terms. The closed-eye posterior 7–13 Hz spectral maximum had slope −0.045 Hz per Karolinska Sleepiness Scale level. The 95% interval from 20,000 person bootstrap samples was −0.129 to +0.020 Hz per level. This test did not establish a linear association. It does not prove no association or equal frequency. All planned alternative frequency measure intervals included zero. A secondary one-month change model gave −0.104 Hz per level, with interval −0.219 to −0.015. Its interval had no correction for multiple tests. It does not replace the primary result. A band maximum can exist without an oscillation peak. The package preserves the local plan, 360 spectra, scores, source hashes, code, all bootstrap samples, results, and instructions. Four complete source EEG files reproduced all saved arrays exactly. A full offline repeat reproduced all 37 outputs exactly. The evidence applies to this young adult sample, source processing, and linear score model. It does not establish causation or prediction.

electroencephalography · EEG · sleepiness · Karolinska Sleepiness Scale · alpha frequency · spectral maximum · within-person analysis