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Scatterplots and linear regression lines for the 28 days of recording of (A) the apnea-hypopnea index (AHI) of rapid eye movement (REM) sleep (AHI REM) versus amount of REM sleep in the night and (B) the AHI of non-rapid eye movement (NREM) sleep (AHI NREM) versus amount of NREM sleep in the night.
