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Sleep Apnea

Maintenance of wakefulness test

Medical prescription compulsory


The Maintenance of Wakefulness Test (MWT) is used to assess patients’ ability to stay alert during a defined period of time in order to validate the efficacy of a treatment for excessive sleepiness (hypersomnolence) or other sleep disorders. The test consists of four rest periods at defined times and specific intervals during which patients, who are seated in the dark, must remain alert. Their brain waves are monitored and recorded (electroencephalogram, or EEG) to analyze their alertness or sleep patterns.


Diagnostic test performed in clinic during the day, the day after a full poly-somnography.


This takes place under the supervision of a respiratory specialist or a medical electrophysiology technologist.

When is this test indicated?

To complete a poly-somnography with CPAP. The objective is to validate the efficiency of the CPAP therapy, notably your awakening capacity.


There is no contraindication linked with MWT.


Procedures and indications to follow