Having a sleep study during pregnancy: what to ask beforehand

Sleep disorders are among the more common problems that arise during pregnancy ¹, so a referral for a sleep study is the start of a process, not a conclusion. Preparing a short list of questions before your appointment helps you understand what is being assessed, how the test works, and what happens with the results.

Ask what the assessment is intended to investigate

A referral for a sleep study can cover a range of concerns. The most common sleep disorders during pregnancy include obstructive sleep apnea, restless legs syndrome, and gastroesophageal reflux disorder ¹. Knowing which of these — or which combination — your clinician wants to evaluate helps you understand why particular sensors or monitoring methods are being proposed, and what a useful result would look like for your care going forward.

Before your appointment is confirmed, ask your referring doctor or midwife the following:

• [ ] What specific symptom or condition prompted this referral?
• [ ] What will the study be looking for, and what would a positive or negative finding mean for my care?
• [ ] Are there results from my prenatal care that have already shaped this decision?
• [ ] Will findings from the sleep study be shared directly with my obstetric team?
• [ ] Is there anything I should start noting or tracking before the appointment date?

Getting clear answers also helps you notice whether your symptoms change before the appointment. Tracking patterns in the weeks beforehand is straightforward with a pregnancy sleep diary to take to your next appointment, and the notes you collect can be useful context for whoever scores the study.

If you have already been noticing changes to your breathing or snoring during pregnancy, the guide on new or louder snoring during pregnancy covers when and how to raise those observations with your care team — a separate but related step from the diagnostic process described here.

Check whether the proposed test is at home or in a clinic

Sleep studies fall broadly into two formats. A home sleep test uses a portable device you wear overnight in your own bed. An in-clinic polysomnography (PSG) takes place in a sleep lab where a wider range of signals — including brain activity, eye movement, and leg movement — are recorded by a technician throughout the night.

Neither format is automatically better for a pregnant patient; the right choice depends on what is being investigated. What matters is that you understand which one is being proposed and why. Questions worth putting to the sleep service include:

• What type of study is planned — home or in-clinic?
• What will the sensors measure, and will any of them be uncomfortable when lying on your side?
• If it is an in-clinic study, can you bring your own pillow or a pregnancy body pillow for comfort?
• If a home test is proposed, what support is available if the device is difficult to fit or stops recording during the night?

Side sleeping is strongly recommended during the second and third trimester ², and arriving prepared to sleep in that position matters for getting a night of rest that is representative of your usual patterns. Sleeping on your side can also help keep the airway more open compared with back sleeping, which may be relevant depending on what the study is assessing ³.

The Cove Pregnancy Pillow is about 52 in (132 cm) along the curve and designed for full-length side support. If space in a clinic bed is a concern, the Cove Pregnancy Pillow Mini is smaller and packs into a suitcase, making it easier to bring along to an in-clinic appointment. Check with the clinic before you pack either one. For a home test, your usual setup is already in place, which removes that concern entirely.

Tell the service about your pregnancy and care instructions

This step is easy to overlook, but it is important. Sleep services do not always receive full clinical context from the referral, and some standard protocols may need to be adapted for pregnancy. The positioning guidance differs — back sleeping is cautioned against in the second and third trimester ² — and some sensors or straps may sit differently on a pregnant abdomen.

When you contact the sleep service to confirm the appointment, work through the following in order:

1. State clearly that you are pregnant and give your approximate stage. 2. Ask whether their standard protocol is modified for pregnant patients. 3. Mention any care instructions from your doctor or midwife that might be relevant, including position guidance or any conditions being monitored. 4. Ask whether the technician or scoring clinician has experience working with pregnant patients. 5. Confirm how results will be handled — whether they go directly to you, to your referring clinician, or both, and over what timeframe.

Do not assume the service already has this information. Stating it clearly at the time of booking, and repeating it when you arrive, is the simplest way to make sure no one is working with an incomplete picture.

Ask what to bring and how results will be explained

Being practically prepared reduces the chance of disrupted sleep on the night, which is in everyone's interest. The table below covers the most useful questions to work through with the sleep service before the appointment date.

For in-clinic studies, it is also worth asking about bed dimensions and available space if you plan to bring a pregnancy pillow. The complete guide to sleeping on your side covers positioning and support approaches in more detail if you are still working out the most comfortable setup for your stage of pregnancy, and that same groundwork is useful preparation for a night in a clinical setting.

Continue your care plan while you wait

A sleep study is a diagnostic step, not a treatment. Results take time to process, and a follow-up appointment is usually needed afterward before any care changes are made. In the meantime, keep following everything your prenatal care team has already recommended — do not put any part of your existing plan on hold while you are waiting.

Sleep quality during pregnancy matters for a range of reasons beyond tiredness, including its relationship to blood sugar regulation and blood pressure ¹. Maintaining a consistent sleep schedule and a bedroom environment that supports rest are things you can continue to work on throughout this period ⁴. Keeping the room comfortably cool through thermostat adjustment, breathable bedding, lighter layers, or a fan can also help, since your body's ability to lower its core temperature is closely tied to how easily you fall and stay asleep ⁵.

Note any new or worsening symptoms between now and when results come back — louder snoring, more frequent waking, increased leg discomfort, or difficulty finding a comfortable position — and bring those observations to your next prenatal appointment rather than waiting for the sleep study follow-up. Your doctor or midwife remains the right person to interpret what the results mean in the context of your pregnancy, to weigh them alongside everything else in your care plan, and to decide what any next steps should look like from there.

More in this series: start with Sleeping during pregnancy and a stuffy nose at night during pregnancy: comfort and care questions.