A practical guide to getting ready for your sleep study — what to do (and avoid) before, during, and after your appointment.
Quick Answer
To prepare for a sleep study, avoid caffeine after noon and alcohol for at least 24 hours, take your regular medications unless told otherwise, shower and avoid lotions or hair products, bring comfortable sleepwear and personal items, and avoid napping so you are naturally tired at bedtime.
Key Takeaways
Proper preparation helps ensure your sleep study produces accurate, useful results. Whether you are doing a home sleep test or an in-lab polysomnography, the steps you take in the days leading up to the study can make a meaningful difference in the quality of your data.
In the days before your study, try to maintain your normal sleep schedule. Going to bed and waking up at consistent times helps regulate your body's natural sleep-wake cycle. Avoid making significant changes to your routine, such as starting a new diet, beginning a new exercise program, or traveling across multiple time zones.
On the day of the study, follow the guidelines below regarding medications, alcohol, caffeine, and personal care. If you have any questions about how to prepare, contact your healthcare provider's office — they can provide specific instructions tailored to your situation.
In most cases, you should take your regular medications exactly as prescribed on the day and night of your sleep study. This includes prescription medications, over-the-counter medicines, and supplements. Stopping medications without your provider's instruction can be dangerous and may affect your sleep.
However, there are some important considerations:
Avoid all alcohol for at least 24 hours before your sleep study. This includes beer, wine, liquor, and any foods or medications that contain alcohol.
Alcohol relaxes the muscles in your throat, which can make sleep apnea worse. If you consume alcohol before a sleep study, your breathing events may appear more frequent or severe than they actually are in your normal sleep. Alcohol also disrupts the normal progression through sleep stages, particularly reducing REM sleep in the first half of the night.
For these reasons, even a single drink can compromise the accuracy of your results. The goal of the sleep study is to capture your typical, natural sleep — and alcohol interferes with that goal.
Avoid caffeine after noon on the day of your sleep study. This includes coffee, tea, energy drinks, soda, chocolate, and any medications or supplements that contain caffeine.
Caffeine is a stimulant that can make it harder to fall asleep, reduce total sleep time, and decrease the amount of deep sleep you get. For an in-lab study, difficulty falling asleep can mean fewer hours of recorded sleep data, which may make the results less reliable or require the study to be repeated.
If you typically consume large amounts of caffeine, you do not need to stop abruptly — but tapering in the days before the study and stopping caffeine after noon on the study day will help ensure you can fall asleep naturally at bedtime.
If you are having an in-lab sleep study, you will spend the night at the facility, so packing thoughtfully will help you feel comfortable and relaxed. Here is what to bring:
Comfortable, loose-fitting sleepwear (two-piece is best for sensor placement)
Toiletries (toothbrush, toothpaste, deodorant, etc.)
Any medications you take in the evening or morning
A change of clothes for the next day
Your CPAP mask and equipment if you already use one
Reading glasses and a book or magazine
Your own pillow (if it helps you sleep better)
Photo ID and insurance card
A list of your current medications and dosages
Any comfort items that help you relax (eye mask, earplugs)
For a home sleep test, you do not need to bring anything — the device is either shipped to your home or picked up from a clinic. Just ensure you have a clean face (no makeup or lotions) for the finger clip and nasal cannula.
Knowing what to expect can help reduce anxiety and make the experience smoother. Here is a general overview of what happens during each type of sleep study:
For an In-Lab Sleep Study:
For a Home Sleep Test:
For more details on the different types of sleep studies, see our sleep study guide or our comparison page.
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You need to stop all medications before a sleep study.
Take your medications as prescribed unless your provider specifically instructs you otherwise. Stopping medications on your own can be dangerous and may affect your sleep.
One drink of alcohol is fine before a sleep study.
Even a small amount of alcohol can relax throat muscles and worsen breathing events, potentially making your results appear worse than they are. Avoid alcohol entirely for at least 24 hours.
You should try to sleep as much as possible during the study.
Just sleep naturally. There is no need to force sleep or try to sleep more than usual. The study records your natural sleep patterns.
You cannot bring anything to a sleep lab.
You can bring personal comfort items like your own pillow, a book, or reading glasses. Making the environment feel as close to home as possible helps you sleep more naturally.
If you have questions about specific medications or medical conditions before your sleep study, contact your healthcare provider. If you experience chest pain, severe shortness of breath, or fainting before or after your study, seek immediate medical attention.
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Symptoms such as loud snoring, witnessed breathing pauses, excessive daytime fatigue, and morning headaches may indicate obstructive sleep apnea. If you experience these symptoms regularly, a professional sleep evaluation is recommended.
Seek immediate medical attention if you experience chest pain, severe shortness of breath, fainting, or any symptoms that feel life-threatening. These may indicate a medical emergency requiring urgent care.
Untreated sleep apnea is associated with elevated risk of high blood pressure, heart disease, stroke, and type 2 diabetes. Do not ignore persistent symptoms — early evaluation and treatment can help protect your long-term health.
This page is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider regarding your individual health concerns.