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Distribution of inspiratory flow limited events and responses by (A) sleep stage (rapid eye movement and non–rapid eye movement sleep) and (B) duration of inspiratory flow limited event (brief, 10–30 s; short, ⩾30–120 s; long, >120 s). Desat = desaturation; EEG = electroencephalography; HR = heart rate; NREM = non–rapid eye movement; REM = rapid eye movement.
