Polysomnogram – Sleep Study

What is a polysomnogram?

A polysomnogram (PSG) measures brain and body activity during sleep. It is performed to help diagnose:

  • Sleep-related breathing disorders (such as sleep apnea)
  • Narcolepsy
  • Sleep-related seizure disorders

A polysomnogram is usually performed while you stay overnight at a sleep center.

What does a polysomnogram measure?

  • brain activity
  • eye movements
  • heart rate
  • blood pressure
  • oxygen saturation in blood
  • how much air is moving through your nose while you breathe
  • snoring
  • chest movements

Your doctor also may use a polysomnogram to find the right setting for you on a CPAP (continuous positive airway pressure) machine. CPAP is the most common treatment for sleep apnea.


Reference: The National Institute of Neurological Disorders and Stroke

Related Topics

This information is for general educational uses only. It may not apply to you and your personal medical needs. This information should not be used in place of a visit, call, consultation with or the advice of your physician or health care professional.

Communicate promptly with your physician or other health care professional with any health-related questions or concerns.

Be sure to follow specific instructions given to you by your physician or health care professional.

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