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A child is prepared for polysomnography (PSG). Polysomnography is a comprehensive recording of the biophysiological changes that occur during sleep. The PSG monitors many body functions including brain (Electroencephalography), eye movements (Electrooculography), muscle activity or skeletal muscle activation (Electromyography), heart rhythm (electrocardiogram), and breathing function or respiratory effort during sleep.

Photo credit: Robert Lawton (cc-by-sa-2.5)