Which diagnostic test is used to measure the brain and body activity during sleep?

Question

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Polysomnogram is a diagnostic test used to measure the brain and body activity during sleep. It involves the use of electrodes to monitor brain waves, eye movements, muscle activity, heart rate, and breathing patterns. This test is commonly used for the evaluation of sleep disorders such as sleep apnea, insomnia, and narcolepsy. A and B are not related to sleep studies, and D is used to assess sensory nerve function in response to stimuli.

Which Diagnostic Test Is Used to Measure the Brain and Body