How to Prepare for a Sleep Study
Reviewed by our editorial team
Last updated: 2026-04-01
Preparing for an overnight sleep study (polysomnography) can feel a bit daunting, but a little planning goes a long way in ensuring the night is as comfortable and productive as possible. The goal of the study is to capture a representative night of sleep, so maintaining your normal routine—within reason—is key.
Most sleep labs are designed like hotel rooms, with private bathrooms and comfortable beds. Knowing what to bring and how to prepare your body for the sensors will help you relax and fall asleep more easily once you arrive at the center.
The Day of the Study
On the day of your study, you should avoid caffeine after lunch and avoid alcohol entirely, as it can significantly alter your sleep architecture. Try not to take any naps during the day, as this will make it harder to fall asleep at the lab's scheduled time.
Follow your normal exercise routine, but try to finish any vigorous activity several hours before your appointment. Eat your normal dinner before arriving, unless the center has told you otherwise.
Personal Grooming and Sensors
Before you head to the lab, shower and wash your hair. Do not apply any hair oils, gels, or sprays, as these can interfere with the conductive paste used to attach the EEG sensors to your scalp. Similarly, avoid body lotions or creams on your skin.
If you have a beard or mustache, you usually don't need to shave it off, but the technician may need to work around it. For women, removing nail polish from at least one finger is helpful so the pulse oximeter can accurately read your oxygen levels.
What to Pack
Pack a bag as if you were staying at a hotel. Bring comfortable, loose-fitting pajamas (ideally a two-piece set to allow for wire placement). Bring your toothbrush, toothpaste, and any other toiletries you use in the morning.
Don't forget your usual medications, but check with your doctor beforehand about which ones you should take. If you have a favorite pillow or a book to read before bed, feel free to bring those along to help you feel more at home.
What to Expect Upon Arrival
When you arrive, a technologist will show you to your room and ask you to change into your pajamas. The 'hook-up' process takes about 30-45 minutes. They will apply small sensors to your scalp, face, chest, and legs using mild adhesives or bands.
Once you are connected, you will have some time to relax, watch TV, or read. The technologist will then perform a 'calibration' where they ask you to move your eyes, blink, and move your legs to ensure all sensors are recording correctly before 'lights out.'
Frequently Asked Questions
References
- [1]Mayo Clinic. Polysomnography: How You Prepare.
- [2]National Sleep Foundation. Preparing for a Sleep Study.
- [3]AASM. Patient Guide to Sleep Studies.
The information on this page is for educational purposes only and is not a substitute for professional medical advice. Always consult a qualified healthcare provider for diagnosis and treatment.