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This is typical trace of an overnight oximetry recording of a patient with MND and sleep-disordered breathing. This MND patient hypo-ventilates during presumed non-REM sleep and further hypo-ventilates during presumed REM sleep (red arrow: awake; light blue arrow: non-REM sleep; dark blue arrow: REM sleep). MND, motor neurone disease; REM, rapid eye movement; NREM, non-REM.
