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MSLT/MWT

Multiple Sleep Latency Test (MSLT) 

 

The MSLT is a sleep disorder diagnostic tool that is used to determine the extent of excessive daytime sleepiness. This is done by measuring the time it takes to fall asleep, as well as the ability to achieve REM sleep during a series of short naps throughout the day. 

 

A sleep physician may recommend a MSLT  to diagnose narcolepsy or idiopathic hypersomnolence. The MSLT is often only undertaken once all other sleep disorders and causes of excessive sleepiness have been ruled out. 

The MSLT is a full-day test that consists of four or five scheduled naps, separated by two-hour breaks. During each nap period, you will lie quietly in bed and try to go to sleep. The test will measure how long it takes for you to fall asleep and if you achieved REM sleep.

Each nap will be taken in a dark and quiet sleep environment. Numerous electrodes placed on your head will monitor you during each nap period.

During the two-hour breaks between tests you must remain at the sleep centre. You are allowed to occupy yourself during the two hours in anyway you like, as long as you avoid any type of caffeine, stimulant, physical exercise and do not sleep. 

If you are scheduled to undertake a MSLT, our administration team will send you information on the test and what to bring. Please contact us if you have any questions in the lead up to your MSLT. 

Maintenance of Wakefulness Test (MWT) 

 

The MWT is used to objectively measure how well a someone is able to remain awake during a time of inactivity. The MWT is often performed after starting a particular treatment to test the effectiveness of improving daytime sleepiness. It may also be used to help judge whether a patient is fit to operate a vehicle or heavy machinery, or perform other daily tasks.

The MWT is a full-day test that consists of four scheduled 40 minute test periods, separated by two-hour breaks. During each test, you will sit quietly in an upright position (either in a chair or on a bed) and try to stay awake for the entire duration of the test. TV's and phones are removed from use during each test and there is not activity to be performed during the test which may assist in remaining alert (example: kicking of legs, talking or singing to yourself, moving about while seated).

During the two-hour breaks between tests you must remain at the sleep centre. You are allowed to occupy yourself during the two hours in anyway you like, as long as you avoid any type of caffeine, stimulant, physical exercise and do not sleep. 

If you are scheduled to undertake a MWT, our administration team will send you information on the test and what to bring. Please contact us if you have any questions in the lead up to your MWT.