Patients who have trouble sleeping without a known cause, do not respond to sleep disorder treatments, or have physical and other sleeping problems – such as snoring – are recommended to have a sleep test to closely evaluate their sleep quality.

The test is performed through polysomnography (PSG) which is a combination of tests – ranging from Electroencephalography (EEG), Electro-Oculography (EOG) and Electromyography (EMG) – to diagnose sleep cycle, stage, pattern and quality.

In addition, ECG will measure the oxygen level in your blood and record movements of your chest and stomach, while also monitoring your airflow and snoring.  This helps assess your pulmonary function, especially for sleep apnea which affects your quality of sleep.

Moreover, PSG includes sleep movements and other sleep-related tests for further analysis.  Thus, PSG is a combination of different equipments in one machine for a complete sleep analysis.  In general, however, this test is not recommended to all patients but only for certain specific cases, and the results will play an important role in the treatment plan.