Yes, you can usually reschedule an overnight sleep study, but the sleep center must confirm the new date. Call as soon as you know you cannot attend, even if the appointment is tonight. Ask about notice rules, possible fees, the next available date, and whether your referral or insurance approval will still be valid. Do not simply miss the appointment; the center may have specific rules for missed visits.
How do you reschedule an overnight sleep study?
The simplest way to change an appointment is to contact the sleep center that booked your study. Use the phone number on your appointment letter, confirmation email, or patient portal. If your doctor arranged the study through a separate testing facility, contact that facility directly rather than assuming your doctor's office can change the booking.
When you call, explain that you need to move your overnight sleep study and ask for the next available appointment. You do not need to share unnecessary personal details, but tell the staff if illness, a change in your work schedule, transportation problems, or another important issue is preventing you from attending.
Before ending the call, confirm the following details:
- Whether your current appointment has been canceled and a new date has been arranged.
- Whether a cancellation fee or other charge may apply.
- Whether your referral or insurance authorization needs to be updated.
- Whether you must complete any forms or repeat preparation instructions.
- Whether any related appointments need to be moved as well.
Keep the confirmation message or write down the new date, arrival time, and contact details. If the clinic is closed when you call, follow the instructions on your appointment notice and contact the center again as soon as it reopens.
How much notice do you need to give?
There is no single cancellation deadline that applies to every sleep center. The required notice depends on the facility's policies and the type of appointment you have booked. Some centers ask patients to provide advance notice and may charge a fee for late cancellations.
For example, UCLA Health asks patients to call at least 48 hours before canceling a sleep study and states that a $50 fee may apply when cancellation notice is not provided within that period. This is a policy for that facility, not a universal rule. Check your own appointment instructions to find out what applies to you.
If you need to cancel on the same day, call anyway. The center may be able to offer another date, but a new appointment is not guaranteed. Giving as much notice as possible also allows the facility to offer the original appointment slot to another patient.
What if you are sick or cannot attend at the last minute?
If you develop an illness, especially one that could be infectious, contact the sleep center before going to the facility. Explain your symptoms and ask whether you should attend or arrange another date. Do not assume that you must attend simply because the appointment is difficult to replace.
North Bristol NHS Trust's guidance on overnight polysomnography advises patients who are unwell or otherwise unable to attend to notify the department as early as possible so that the appointment can be rescheduled. Each service has its own rules, so contact your own facility for instructions.
If you are running late rather than canceling, call the sleep center immediately. Overnight studies have planned arrival and setup times, and the staff will need to determine whether the recording can still go ahead that night. Do not assume you have lost the appointment, but do not arrive late without informing the team.
Will rescheduling affect your sleep study or its results?
Changing the date before the test takes place does not, by itself, change the results of a study that has not yet been performed. The main practical concern is whether the delay affects when your healthcare professional can review the results and decide on any next steps. The time until your new appointment depends on the sleep center's availability and scheduling requirements.
An overnight sleep study, also called polysomnography, records several body functions while you sleep. According to MedlinePlus, an overnight study at a sleep center may monitor breathing, heart rate, oxygen levels, brain activity, and movements during sleep. Because the test is planned around your sleeping hours, the replacement appointment must allow enough time for the recording and any required preparation.
If your clinician has said that the test is time-sensitive, explain this when requesting a new date. Contact the clinician who ordered the study if you are concerned that a long delay may affect your evaluation. If the appointment includes an overnight study followed by a separate daytime test, ask the sleep center whether both parts need to be rescheduled together.
Will you need to repeat the preparation instructions?
Yes, you should check the preparation instructions again when your appointment changes. Do not assume that your previous instructions are still suitable for the new date, particularly if you have changed medicines, developed an illness, or received different directions from your healthcare team.
Mayo Clinic's guidance on polysomnography recommends avoiding alcohol and caffeine during the afternoon and evening before the test and avoiding an afternoon nap. It also notes that patients may be asked to shower before the study and avoid applying products such as lotions or hair gels that can interfere with the sensors. Follow the instructions provided by your own sleep center, as preparation requirements may differ.
If you take prescription medicines, do not stop or change them just because the appointment has moved. Ask the clinician or sleep center whether your existing medication instructions still apply. If you have been asked to keep a sleep diary or complete a questionnaire, check whether you need to continue recording information or update the paperwork before the new date.
Should you postpone the test if you are worried you will not sleep?
Not necessarily. Sleeping in an unfamiliar room or having sensors attached to your body may make it harder to settle down, but this does not automatically mean the test will be unsuccessful. Cleveland Clinic explains that a sleep study is generally scheduled around a person's usual sleeping hours, with the timing sometimes adjusted for people who work nights or have different sleep schedules.
If your main concern is that you may struggle to fall asleep, tell the sleep center before canceling. The staff can explain what to expect and whether your usual sleep schedule needs to be considered when arranging the appointment. If you have already taken steps to prepare for the original date, ask whether any of those arrangements need to change.
When should you contact the clinician who ordered the study?
For a routine scheduling change, the sleep center is usually the best first contact. However, contact the ordering clinician if you have been told that the test needs to occur within a particular period, cannot obtain a replacement appointment for a long time, or have concerns about postponing it because your symptoms are changing.
If you experience increasing daytime sleepiness that affects driving or other safety-sensitive activities while waiting for the study, avoid driving when you cannot stay alert and seek advice from a healthcare professional. Do not wait for a rescheduled test to raise a new or worsening health concern.
What is the best way to avoid scheduling problems?
Check your appointment date, arrival time, travel arrangements, and any preparation requirements as soon as the booking is confirmed. If you know in advance that work, caregiving, or another commitment will prevent you from attending, request a change early rather than waiting until the day of the test.
After rescheduling, make sure you know where to go, when to arrive, what to bring, and whom to contact if a problem arises. If the clinic cannot offer a suitable replacement date, ask whether it has a cancellation list or whether the clinician who referred you can help identify another appropriate option.