Large sleep EEG study maps changing spectral power across the night
Published in Brain Activity, Brain/Neurology, Journals.
Published October 31, 2026.
A study published today in Scientific Reports examines how sleep-related brain signals change over a night. Ghosn and colleagues applied automated quantitative EEG analysis to 10,000 high-resolution overnight polysomnography cases, comparing the first, middle and last occurrences of each sleep stage.
Across all sleep stages, power in the 1–20 Hz range was lower in the last occurrences than in the first. The trajectory was not uniformly downward: delta and theta power increased during middle occurrences of N1 and N2 sleep. Patterns also differed between brain regions.
Associations with clinical outcomes reached statistical significance but had modest effect sizes. These findings describe sleep physiology; they do not establish a diagnostic test, demonstrate causation or show that people need less sleep. The peer-reviewed accepted article remains subject to further editorial changes.
Source: Ghosn et al., Scientific Reports, October 31, 2026.