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Multiple Sleep Latency Test (MSLT)

An MSLT is used to diagnose sleep disorders that cause excessive daytime fatigue and sleepiness (narcolepsy and hypersomnia).

The test measures the time it takes for you to fall asleep, the different stages of sleep, and any unusual breathing patterns.

The test will take most of the day. For the test, a nurse will attach small electrodes to your scalp, face and legs to monitor your level of alertness and any changes in it. The electrodes will remain attached for the duration of the test. The test consists of four registration sequences of approximately 20-40 minutes, during which you will try to fall asleep in a dark, quiet room. Each sequence will be recorded on video.

You will be served lunch during the day. After the test, the nurse will remove the electrodes and clean your skin, but you may want to wash your hair.

To prepare for the test, you will be asked to keep a sleep diary for two weeks. You should sleep as regularly as possible for a week before the test. The night before, you should get at least 6 hours of sleep. At-home sleep registration will be carried out to ensure this. Make sure that your hair and scalp are clean on the day of the test. Our clinical neurophysiology specialists will provide a statement on the registered data.

Preparing for your examination