A Polysomnography (PSG) test is done to identify any sleep disorders. Done while you’re fully asleep, specialized equipment is used to record data on your sleep patterns. This equipment monitors your heart, lung and brain activity, breathing patterns, arm and leg movements, and blood oxygen levels. Data obtained will be used to chart your sleep cycles to determine sleep apnea.
PSG registers two stages of sleep, rapid eye movement (REM) sleep, and non-rapid eye movement (non-REM) sleep. Observing your sleep cycles, along with your body’s reactions to the changes in these cycles, can help identify disruptions in your sleep patterns.
You should avoid consuming alcohol and caffeine during the afternoon and evening of the test. You should also avoid taking sedatives.
Your test starts 2 hours before your usual bedtime and you will sleep overnight at the hospital where the test is conducted.
Sensors, or electrodes, will be placed on your scalp, temples, chest and legs while you sleep to to record data that is sent to a computer. A video recording may also be done to to review changes in your body position while you sleep.
The sensors are removed in the morning when you wake. You can leave and continue with your regular activities after.
You will be given a follow up appointment to review your test results. Depending on your results, you may be advised to use a continuous positive airway pressure (CPAP) device. This device will provide a constant air supply to your nose or mouth while you sleep. Should you feel unwell, contact your doctor immediately or call our 24-Hour Medical Urgency Clinic.
