What Is An Polysomnogram (PSG) with MSLT?
A polysomnogram (PSG) is a sleep study that helps determine whether or not you have a sleep disorder. While you sleep, sleep patterns and behaviors such as brain waves, heart rate and breathing, eye and leg movements, and the oxygen level in your blood are recorded. A PSG can be done at night or during the day and a trained sleep technologist supervises the sleep study.
The multiple sleep latency test (MSLT) determines excessive daytime sleepiness by measuring how quickly you fall asleep in a quiet situations during the day, and how quickly and how often you enter REM sleep. The MSLT is sometimes referred to as the daytime nap study and is used to diagnose narcolepsy or idiopathic hypersomnia. It is always a follow-up test to the overnight PSG which is used to rule out other sleep disorders such as sleep apnea, restless leg syndrome and parasomnias.
When you arrive for your sleep study, a Registered Polysomnographic Technologist (RPSGT) or Registered Respiratory Therapist (RRT) will be at the site to greet you and show you to your room. After you make yourself comfortable, your technologist will take a brief history, explain the study process, and answer any questions you may have prior to applying the sensors.
What To Expect
First, the technologist will use stickers to affix leads on your legs and chest. You will also have two belts placed around your chest and abdomen that monitor your body’s efforts to breathe.
Next, your head will be marked and measured with a paper ruler and a grease pencil. This is done because each electrode on your head needs to be in a precise location. Once this is complete, a skin prep jelly will be applied to clean the scalp for the electrodes.
Electrodes are then placed on the surface of your scalp with a small amount of paste. The prep, paste, and tape are hypoallergenic.
You'll also have a nasal cannula (similar to an oxygen cannula) to monitor your breathing. You will not receive oxygen during your PSG.
This process is completely painless and generally takes about 40 minutes to make sure everything is placed correctly.
Once you’re fitted with the sensors, you can relax in your room, catch up on phone calls, enjoy Smart/Cable/Vios TV, Wi-Fi, or read until "Lights Out" at 11pm. Yes, you may eat, drink, and use the bathroom throughout the night! We want you to feel comfortable and relax as you would at home prior to going to sleep. You may bring your own food/snacks. Should you need to get up at all during the night, simply let your technologist know.
Your technologist will monitor your sleep throughout the study and will be available to answer questions and ensure you’re comfortable.
In the morning, the technologist will remove some of the sensors used the night before and will explain the multiple sleep latency test (MSLT), during which you will have 5 half hour naps with the first one beginning at about 8:00am. In between naps, you can relax, catch up on phone calls or read. Lunch is provided; please notify us of any special dietary needs when you arrive.
All Done, Now What?
When the study is done, the technologist will remove all the wires and sensors. Any remaining paste or marks can be easily washed out using warm water and shampoo.
At your follow-up appointment, you will receive your sleep study results and discuss them with your provider.
Set Time Aside
The PSG with MSLT is an overnight test followed by a daytime test. After you spend the night, the PSG will end at approximately 6:30am and the MSLT will start at 8am.
Plan on being at our sleep center from approximately 7:00-9:00 pm until 5:00pm the following day.
Wash and Dry Your Hair
Wash and dry your hair thoroughly but do not use conditioners or other hair products.
Remove any hair weaves or extensions. We cannot do testing with either of these.
Acrylic or Applied Nails
If you have acrylic nails or applied ("fake") nails an index fingernail needs to be removed for the oxygen reading. If you have gel nail polish, the polish from one of the index fingers will need to be removed. Regular nail polish is fine. The oximeter does not read through acrylic or applied nails, nor gel polish.
What Should I Wear?
Wear comfortable, loose-fitting, two-piece clothing. You must wear pajamas or two-piece clothing for the test.
Bring – and take – all of your normally scheduled medications unless otherwise directed by your doctor or the staff at Sleep Insights.
Special Requirements and Guests
Guests are not allowed to stay overnight with patients other than for specific medical reasons (e.g. parent with a child, caregiver for patient with special needs). Arrangements for caretakers must be made with advanced notice and with prior permission from their provider. Anyone accompanying a patient to their sleep test who isn’t an approved caretaker must leave at 9pm.
Smoking, vaping and the use of alcohol are not permitted in the building or on the premises at any time.
Please avoid caffeine intake after dinner on the day of your study. We have caffeine free beverages available at the sleep center for you.
Cancellations must be made by at least 12 noon the day before your study, or if your study is on a Saturday or Sunday, by noon on the Friday before.
Failure to show up for your scheduled sleep study will result in a $100.00 no-show charge.