Stock Photo - Reportage in the sleep laboratory at Lyon-Nord Rillieux polyclinic. Carrying out a polysomnography exam over night. Polysomnography consists of recording, during sleep, several physiological variables in order to determine certain sleep disorders. 7.30pm: setting up the specific equipment, an oxymeter is placed at the end of the patientÆs finger in order to measure oxygen levels in the blood.

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