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Sleep Apnea

Iterative test

Medical prescription compulsory


The Multiple Sleep Latency Test (MSLT) is used to clinically evaluate excessive daytime sleepiness (hypersomnolence), and can help in diagnosing narcolepsy. The test consists of giving patients the opportunity to take four or five naps during the day at predetermined times and specific intervals. They are instructed to try to sleep during each nap. Their brain waves are monitored and recorded (electroencephalogram, or EEG) to analyze their sleep patterns.


Diagnostic test realized during the day to determine the drowsiness delay.


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

When is this test indicated?

This test is used to confirm narcolepsy diagnosis.


The multiple latency sleep test should not be performed in a patient who has not slept in the days before the test or in a person working usually at night and sleeping during the day.


Procedures and indications to follow