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)
- 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
- 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