Polysomnography (PSG)

Need to know

• What happens during the PSG study? icon plus

  You'll arrive at the hospital on the evening of your scheduled sleep study. A porter will welcome you and show you to your private en-suite bedroom. Your consultant will attach a number of sensors to your head, chest and legs using small sticky pads or bands to hold them in place.
  
  These painless sensors monitor important bodily functions while you sleep, including brain waves, eye movement, heart rate and muscle activity. You'll also have a clip on your finger to measure your oxygen levels and a sensor to measure your breathing. You'll be monitored throughout the night via video. Despite all the sensors, most people are still able to sleep.

• How to prepare icon plus

  Your consultant will explain the test to you and answer any questions you may have. They'll talk to you about your sleeping patterns and any problems or symptoms you're experiencing. They'll let you know how to prepare for your hospital stay and if there is anything specific you need to do before the test. This may include avoiding certain medications, caffeine, smoking or alcohol. You may also be asked to keep a sleep diary in the days or weeks leading up to your test.

• After your PSG sleep study icon plus

  After your test your consultant will remove the sensors and let you know about any next steps. If you're not staying for further diagnostic tests, you should be able to return home that morning.
  
  Your consultant will review the video alongside the other measurements taken throughout the night to help diagnose a potential sleep disorder. The video is particularly important if you experience seizures or nocturnal epilepsy. You'll come back for a follow-up appointment to review your results and discuss options for treatment or further assessments if needed.