Polysomnography

Polysomnography is the name given to the measuring of various aspects of physiology in order to determine whether someone is asleep, and if they are, which stage of sleep they’re in. The term combines Greek and Latin words: poly, meaning “many” in Greek; and somnus, meaning “sleep” in Latin. In order to determine stage of sleep, we only need to combine three measurements: the electrical activity in the brain (EEG); eye movements (EOG); and muscle movements (EMG). Other measurements are needed for diagnosing sleep disorders, such as heart rhythm (ECG), respiration, and/or blood oxygen levels.

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