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Representative compressed polygraph segments from one participant. Compressed polygraph during non-rapid eye movement (NREM) sleep shows hyperventilatory period (x) in response to sustained hyperoxia. A decline in tidal volume, at onset of hyperoxia, was not a consistent finding in all individuals. PetCO2, end-tidal Pco2; Pmask, mask pressure; PetO2, end-tidal Po2.
