Sleep studies monitor the changes in body processes during a period of normal sleep. Variables that are usually monitored during sleep include oxygen levels in the blood, brain activity, heart rate, blood pressure, airflow in the respiratory passages, and movement of the chest wall and the abdomen. If you undergo testing in a sleep laboratory, you may need to stay overnight.
From the 2010 revision of the Complete Home Medical Guide © Dorling Kindersley Limited.
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