Test: Sleep Studies

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.

In the sleep laboratory

You will be attached to instruments that will continuously monitor various body functions while you are sleeping.


Trace indicating sleep apnoea

A trace of a 2.5 minute period of sleep shows oxygen levels falling each time breathing temporarily stops, indicating sleep apnoea. The heart rate rises in response to the lower oxygen levels.

From the 2010 revision of the Complete Home Medical Guide © Dorling Kindersley Limited.

The subjects, conditions and treatments covered in this encyclopaedia are for information only and may not be covered by your insurance product should you make a claim.

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