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Multiple Sleep Latency Test (MSLT)

This test measures the ability or tendency to fall asleep under certain conditions. It should be performed following an overnight stay in hospital when a sleep study has been performed.

You will already have some electrodes attached to your body; on your head, round your eyes, under your chin and on your chest. The information gathered from these electrodes will enable the healthcare professional performing the test to determine if you fall asleep and the stage of sleep you are in.

You will be given 4 or 5 nap opportunities at 2 hour intervals throughout the day.  The first nap opportunity will usually begin 2 to 3 hours after the end of the overnight recording. It is important that you do not sleep in-between the nap opportunities.

You may be asked to stop taking certain medications for 2 weeks prior to the test and you should not smoke for at least 30 minutes prior to each nap opportunity.  You should avoid drinks containing caffeine (tea, coffee, Coca-Cola etc.), Red Bull and caffeine tablets for at least 12 hours before the tests are performed.  Full instructions will be sent to you when you receive your appointment for your tests.  Please read these carefully and if in any doubt ring the department directly with any questions.

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