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Comparison of respiratory cycle-related electroencepholographic changes (RCREC) between original electroencephalograph (EEG) and its phase-randomized surrogate in delta, theta, alpha, sigma, and beta frequency bands with respect to sleep stage within the control group at baseline PSG (* P < 0.05, ** P < 0.01, *** P < 0.005, **** P < 0.001). REM, rapid eye movement sleep; SWS, slow wave sleep.
