A comprehensive test that records several signals at once
As the name suggests, polysomnography records brain waves, muscle activity, eye movement, breathing, and blood oxygen levels simultaneously over a night of sleep. That combination is what allows it to capture sleep quality and breathing patterns together in a way no single measurement could on its own.
General information, not a diagnosis
This page explains what a polysomnography test measures and how it's performed, as general educational information. It is not a diagnosis or treatment recommendation for any specific sleep disorder; if you suspect a sleep problem, talk with a healthcare provider about whether testing is appropriate.
Frequently Asked Questions
Does an unfamiliar sleep environment affect the results?
It can. Some people find it harder to fall asleep naturally in an unfamiliar lab setting than they would at home. Clinicians account for this when interpreting results, and a repeat test is sometimes recommended if needed.
Does an AHI number alone diagnose a sleep disorder?
No. AHI is an important reference number, but a clinician reaches a diagnosis by considering it together with symptoms, oxygen level changes, and other test findings; a single number on its own isn't meant to be self-diagnosed.