For an overnight sleep study, you should bring comfortable sleepwear, your regular toiletries, any medications you normally take, a pillow if you prefer your own, and items that help you wind down before bed. Packing thoughtfully makes a real difference to how settled you feel in the clinic environment, which in turn helps produce more accurate results. Below, we answer the most common questions patients have before their first overnight sleep study.
What actually happens during an overnight sleep study?
During an overnight sleep study, a trained sleep technician attaches small sensors to your scalp, face, chest, and legs using a mild adhesive gel. These sensors monitor your brain activity, breathing patterns, oxygen levels, heart rate, and body movements throughout the night. You sleep in a private room while the equipment records data, and the technician monitors everything from a nearby station.
Most patients are surprised by how comfortable the process is. The sensors do not cause any discomfort, and you are free to move, use the washroom, and sleep in your preferred position. The room is kept dark and quiet, much like a hotel room, to encourage natural sleep. A Level 3 sleep study is a highly effective diagnostic tool that captures enough detailed information to identify conditions like obstructive sleep apnea and guide your treatment plan from there.
What should you pack for an overnight sleep study?
You should pack the essentials you would bring to any one-night stay away from home. The goal is to feel as comfortable and relaxed as possible so your sleep is as close to your normal pattern as the setting allows.
- Comfortable sleepwear: Loose-fitting pyjamas or a sleep shirt work best. Avoid one-piece sleepers or anything restrictive around the chest.
- Your own pillow: If you sleep better with a specific pillow, bring it. Familiarity helps.
- Toiletries: Toothbrush, toothpaste, face wash, and anything else that is part of your bedtime routine.
- Morning essentials: Bring a change of clothes and whatever you need to get ready for the day, since you will leave the clinic after the sensors are removed in the morning.
- A book or light entertainment: You may have some time before the technician begins setup, so a book or something calming to read helps you settle in.
- Your medications: Bring all prescription medications in their original packaging. We cover this in more detail below.
- Any medical devices you use: If you already use a CPAP machine or other device, bring it along unless instructed otherwise.
Keep your bag simple. You do not need much for one night, and a lighter bag means less to manage when you arrive.
Are there things you should avoid bringing to a sleep clinic?
Yes. A few items can interfere with the quality of your sleep study results or disrupt the clinic environment. Avoid bringing anything that might affect your natural sleep patterns or make the sensor application more difficult.
- Hair products: Do not apply hairspray, dry shampoo, or heavy conditioner before your study. These products make it harder for the scalp sensors to pick up accurate readings.
- Caffeine or alcohol: Do not bring energy drinks, coffee, or alcohol to consume at the clinic. Both substances significantly affect sleep architecture and can distort your results.
- Nail polish: If you wear nail polish, remove it from at least one finger before your study. The oxygen sensor clips onto a fingertip and reads through the nail.
- Heavily scented products: Strong perfumes or lotions can affect other patients and staff in the clinic.
- Unnecessary valuables: Leave expensive jewellery or items you would be worried about at home.
What should you do to prepare the day before your sleep study?
The day before your overnight sleep study, focus on keeping your routine as normal as possible. Avoid napping during the day, since arriving at the clinic tired but not exhausted is the ideal state for producing natural sleep data. Stick to your usual sleep and wake times in the days leading up to your study.
On the day itself, wash your hair in the morning but skip any styling products. Eat your regular meals at your regular times, and avoid caffeine after midday. If you exercise, a light workout earlier in the day is fine, but avoid vigorous exercise in the evening as it can delay sleep onset. Arrive at the clinic at the time specified in your appointment confirmation, and give yourself a few minutes to settle in before the setup process begins.
Can you take your regular medications before a sleep study?
In most cases, yes, you should continue taking your regular medications before an overnight sleep study. Stopping medications without medical guidance can be harmful, and your sleep specialist needs to see how you sleep under your actual, everyday conditions. Always bring your medications in their original containers so the technician can note what you are taking.
That said, some medications do affect sleep patterns, and your referring physician or sleep clinic may give you specific instructions about particular drugs. If you take sleeping pills, sedatives, or stimulants, contact us ahead of your appointment to confirm whether any adjustments are needed. Never stop a prescribed medication on your own without speaking to your doctor first.
What happens after your overnight sleep study is complete?
After your overnight sleep study, the technician removes the sensors, which takes only a few minutes and causes no discomfort. You are then free to go about your day. The raw data collected overnight is sent to a sleep physician for analysis, and your results are typically available within one to two weeks.
Once your results are ready, you will receive a follow-up appointment to review your diagnosis. If your study confirms a condition like obstructive sleep apnea, the next step is building a treatment plan. For many patients, this means starting CPAP therapy, which works by delivering a continuous stream of air pressure to keep the airway open during sleep. The benefits of effective CPAP therapy are significant: improved sleep quality, reduced daytime fatigue, better concentration, and long-term improvements to cardiovascular health. Getting an accurate diagnosis through a Level 3 sleep study is the first and most important step toward those outcomes.
How Dream Sleep Respiratory supports your sleep study journey
At Dream Sleep Respiratory, we guide patients through every stage of the process, from booking your overnight sleep study to reviewing your results and building a personalized treatment plan. Here is what you can expect when you come to us:
- Private, comfortable sleep study rooms designed to feel as relaxed as possible
- Experienced respiratory therapists and sleep specialists who walk you through the setup and answer your questions
- Level 3 sleep studies that deliver accurate diagnostic results and lead directly to effective treatment
- Personalized CPAP therapy plans if sleep apnea is confirmed, including equipment fitting, ongoing adjustments, and patient education
- Clinic locations across Alberta, including Calgary, Edmonton, Red Deer, Canmore, Cochrane, Olds, and Lethbridge, so care is accessible no matter where you live
If you are ready to find out what is really happening while you sleep, we are here to help. Contact us to book your overnight sleep study and take the first step toward better rest and better health.
Frequently Asked Questions
How long does an overnight sleep study actually take, and what time should I expect to leave in the morning?
Most overnight sleep studies run from roughly 9:00–10:00 PM through to 6:00–7:00 AM, giving the sleep physician enough data to make an accurate diagnosis. Sensor removal takes only a few minutes, so you can typically be out the door and on your way to work or other commitments shortly after waking. It is worth confirming the exact check-in and expected departure times with your specific clinic when you book.
What if I'm a light sleeper or I'm worried I won't be able to fall asleep at all?
This is one of the most common concerns patients have, and the good news is that sleep technicians are experienced with it. You do not need a full eight hours of sleep for the study to produce usable data — even a few hours of recorded sleep is typically sufficient for a reliable diagnosis. Bringing familiar comfort items like your own pillow, practicing your normal wind-down routine, and arriving a little tired (by skipping your afternoon nap) all help. If anxiety about the study is significant, mention it to your doctor beforehand, as they may have additional guidance.
Can I get up to use the washroom during the night without disrupting the study?
Yes, absolutely. The sensor leads are designed with enough length to allow you to get up and move around, and the technician will assist you if needed. Simply press the call button in your room and the technician will disconnect the leads from the recording equipment so you can walk to the washroom comfortably. This is a completely normal part of the process and does not invalidate your results.
Is a sleep study covered by insurance or provincial health coverage in Alberta?
Coverage depends on your specific plan and the type of study ordered. In Alberta, physician-referred sleep studies may be eligible for partial or full coverage under Alberta Health Services, while private insurance plans vary widely in what they cover for diagnostics and follow-up CPAP equipment. It is best to contact your insurance provider before your appointment and ask your clinic about any direct billing options they offer, so you have a clear picture of your out-of-pocket costs ahead of time.
What's the difference between a home sleep test and an overnight sleep study at a clinic, and how do I know which one I need?
A home sleep test (typically a Level 3 study) uses a portable device you wear overnight in your own bed and is well-suited for diagnosing obstructive sleep apnea in patients with a moderate-to-high likelihood of the condition. An in-lab overnight study (Level 1 or Level 2) involves more comprehensive sensor monitoring and is generally recommended when other sleep disorders — such as restless leg syndrome, narcolepsy, or parasomnias — are suspected, or when a home test has produced inconclusive results. Your referring physician or sleep specialist will determine which study is appropriate based on your symptoms and medical history.
How soon after my results come back can I start CPAP therapy if sleep apnea is confirmed?
Once your sleep physician has reviewed your results and confirmed a diagnosis — typically within one to two weeks of your study — your follow-up appointment is used to discuss your findings and begin building a treatment plan. If CPAP therapy is recommended, the process of selecting and fitting your equipment can often begin shortly after that appointment. Many patients are using their CPAP device within a few weeks of their original sleep study, so the turnaround from diagnosis to treatment is generally quite fast.
What if my sleep study results come back normal but I still feel exhausted during the day?
A normal sleep study result rules out conditions like obstructive sleep apnea but does not mean your fatigue has no cause — it simply means the investigation continues. There are many other contributors to poor sleep quality and daytime exhaustion, including insomnia, circadian rhythm disorders, thyroid issues, anemia, and mental health conditions, among others. Share your ongoing symptoms with your referring physician so they can determine the appropriate next steps, which may include additional testing or a referral to another specialist.