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All-night spectral EEG power during experimental nights (FR1, FR2 and REC) expressed relative to baseline night values, separately for morning types (open symbols) and evening types (filled symbols). Spectral power was calculated in NREM sleep (stages 2, 3, and 4 sleep) for the Fz (A), Cz (B), and Pz (C) derivations. Hz bins are identified by their lower boundary value. Bold Hz bins indicate significant Night effect and stars indicate significant Group-by-Night interactions.
