How to prepare for your sleep study

The night before a sleep study is not a wellness retreat. The goal is a technically usable recording of how you actually sleep and breathe. Caffeine after lunch, a late nap, hair gel, and a skipped sensor can all waste the appointment. Home tests and lab nights share that logic and differ in what you pack.

Does preparation change if the test is at home or in the lab?

Yes, in the bag and in the wiring. No, in the day-of rules that protect the recording. The American Academy of Sleep Medicine’s 2017 diagnostic-testing guideline (Kapur and colleagues) decides who should have which test. That decision is already made before you pack. This article is about the night itself.

In brief, so you know why your instructions look the way they do: polysomnography in the laboratory is the standard diagnostic test when OSA is a concern after a full evaluation. A home sleep apnea test with a technically adequate device is an option for uncomplicated adults whose signs point to a higher chance of moderate to severe obstructive apnea. “Uncomplicated” and “increased risk” are defined terms, not vibes. Increased risk, in the guideline’s at-a-glance sheet, means excessive daytime sleepiness plus at least two of: habitual loud snoring; witnessed apnea, gasping, or choking; diagnosed hypertension. The lab, not the home test, is the strong recommendation when there is significant cardiorespiratory disease, possible respiratory-muscle weakness, awake hypoventilation or suspected sleep-related hypoventilation, chronic opioid use, a history of stroke, or severe insomnia. If a single home test is negative, inconclusive, or technically inadequate, the next step is in-lab polysomnography. Questionnaires do not diagnose OSA.

If you want the clinical fork in more detail, read the practice’s sleep testing page. The rest of this piece is what to do with your Thursday so Friday’s data can be read. For the condition itself, see sleep apnea.

What should you do, and skip, on the day of the test?

AASM’s patient handout for an in-lab study, and the matching home-test handout, give the same short list:

• Keep your regular routine as much as possible.
• Do not nap.
• Do not drink caffeine after lunch.
• Talk with your clinician about whether to take your usual medicines that day.

For the lab night, AASM also says not to use hair sprays or gels, because they interfere with the recording. For the home test, AASM Sleep Education’s patient page adds: eliminate alcohol and/or caffeine after lunch. AAST’s 2020 HSAT technical guideline, written for technologists who instruct patients, repeats the same day-of advice: regular routine, no nap, no caffeine after lunch, and the physician should say whether medicines change.

Those rules exist because the recording is supposed to resemble your typical sleep. A 2 p.m. espresso delays sleep onset. A 4 p.m. nap steals the sleep pressure you need at 10 p.m. Alcohol fragments sleep and changes breathing. None of that is a moral lecture. It is how you avoid a night that cannot be scored.

Do not invent a more aggressive taper on your own. AASM’s separate MSLT/MWT protocol document is stricter about caffeine, alcohol, marijuana, and REM-active drugs because those tests measure sleepiness, not just apnea. If you were scheduled only for a diagnostic night or a home apnea test, follow the day-of list above unless Dr. Qadoom’s office gave you a different plan. If a next-day nap test is on the order, ask. Those instructions are not interchangeable.

Which medicines stay, and which get a phone call?

Bring every prescription you will need overnight. Sleep labs do not stock your pills. AASM’s in-lab handout says to bring medications as directed by your health care provider and to speak with that provider about whether to take them during the study.

Do not stop a blood-pressure medicine, an antidepressant, or a sleep tablet because a forum said it “ruins the study.” Some drugs change sleep architecture. Some drugs are unsafe to skip for a night. The person who ordered the test is the one who can weigh that. Over-the-counter cold pills, pain relievers, and melatonin count. Tell the technologist what you took that day. Write the list before you leave home. Memory at 9 p.m. in a dark room is a poor formulary.

If you use CPAP already and this is a titration or a check, bring the machine and the mask you actually wear, not the spare in the closet. If this is a first diagnostic night, you may still be fitted with a mask during the study if the protocol is split-night. AASM’s patient handout explains that a split-night can start CPAP during the same recording when moderate to severe OSA shows up and enough time remains. That is a laboratory decision, not something you request at check-in to “get it over with.”

What belongs in the bag for a lab night?

AASM’s in-lab handout: comfortable pajamas and what you need for your nightly routine, such as a toothbrush and toothpaste, plus medications as directed. You arrive in the early evening. There will not be another patient in your room. There is a bathroom. Sensors are glued or taped. Tell the technologist about adhesive allergies.

A practical Westerville-area packing list, built on that skeleton:

• Two-piece pajamas or a shirt that buttons. Sensors go on the chest, legs, face, and scalp. A tight turtleneck fights the wires.
• Tomorrow’s clothes, including whatever you need to drive home.
• Your own pillow if that is how you fall asleep. Ask when you schedule; some rooms allow it, some have infection-control rules for bedding from home. this lab’s pillow policy before promising patients they can bring one.
• Prescription medicines in original bottles, plus a written list of doses and times.
• Contact-lens case and glasses. You will want to see in the morning when paste is in your hair.
• A book if you read before lights-out. Phones are a problem if you scroll in bed and then cannot sleep. Ask the technologist what the house rule is.
• Toiletries: unscented if you have a choice. Skip the hair oil.

Wash your hair with shampoo. Skip conditioner, oils, sprays, and gels. AASM is protecting electrode contact, not judging your routine. Clean skin holds paste. Product films do not.

Leave jewelry that sits on the scalp or chest at home. If you have a cold, call. Several academic labs cancel respiratory-infection nights because nasal congestion and cough change the tracing. We would rather reschedule than score a stuffed-up night and call it your apnea severity.

You will be on camera so the technologist can see if a lead pops off. That is safety and signal quality, not entertainment. Most people sleep enough for a diagnosis even if the night feels short. AASM says so in the same handout. If you truly do not sleep, that is data too, and it is a reason to talk, not a reason to declare the test “failed” in the parking lot. The technologist cannot give you the final result in the morning. A sleep specialist reads the study. That can take several days.

What is different about a home-test night?

You sleep in your bed. You apply the sensors. There is no technologist at 2 a.m. to restick a probe. That is the entire difference that matters for preparation.

AASM Sleep Education: follow your regular routine, avoid napping, eliminate alcohol and/or caffeine after lunch. Pick up the device at the office or have it delivered. Learn the setup before bedtime. Ask questions while a person is still in the room. Go to bed at your usual time. Attach sensors as instructed. You may need a sleep log or a button-press when you get into bed. In the morning, remove the sensors and return the device the way the center told you.

AAST’s technical guideline adds two operational facts patients feel: a slipped or disconnected oximeter probe is one of the more common reasons a home test fails, and patients should have a way to reach technical support. Call that number for a loose belt. Call 911 for a medical emergency. The device is not a nurse.

Kapur 2017 defines a technically adequate diagnostic home test as at least four hours of technically adequate oximetry and flow, recorded over an attempt that covers the habitual sleep period. If you take the cannula off at 1 a.m. because it itches, you can fall below that floor. Tape and patience are part of prep. So is putting the finger probe on a clean, polish-free nail if the kit uses a fingertip oximeter. AAST describes pulse oximetry as the recommended blood-oxygen sensor and stresses secure attachment. We did not find an AASM sentence that bans nail polish by name. If your kit’s instruction sheet says to remove polish from the test finger, follow the sheet. this practice’s HSAT model and whether the instruction card names nail polish.

Nasal-pressure cannulas miss mouth breathing. That can look like a pause in airflow when you are simply breathing through your lips. Do not “help” the test by forcing yourself onto your back all night unless you were told to. Lie the way you lie. Position is part of the physiology. A night spent performing for the belt is a different night than the one that gave you the referral.

Pets and toddlers pull sensors. If the bedroom is not yours alone, plan the night. A technically inadequate home test is not a small inconvenience. Under Kapur, it is an indication for in-lab polysomnography, which is a longer evening and a different copay conversation.

What should you skip even if it feels like “getting ready”?

Skip the extra wine “to sleep in a strange bed.” Skip the unaccustomed sleeping pill unless the ordering clinician prescribed it for the study night. Skip the 6 p.m. workout that is not your habit if it leaves you wired. Skip changing your usual bedtime by two hours in either direction. Mount Sinai’s patient PDF, which we opened as a lab-prep example, tells patients not to alter the sleep schedule in the week before unless the sleep physician said to, and to avoid caffeine after noon and alcohol on the day of the study. That is one center’s protocol, not AASM’s national minimum, but it matches the spirit: a representative night.

Skip arriving late. The hookup takes time. Sensors that are rushed are sensors that fall off. If you will miss the arrival window, call the number on your instruction sheet. Do not assume the bed is held until midnight.

Skip diagnosing yourself from the snore you hear on the hallway walk. The study is the instrument. AASM’s good-practice statement is that testing happens with a comprehensive evaluation and follow-up. The night is one piece.

What happens after you wake up?

Lab: sensors come off. You may have paste in your hair. Plan time to wash before work if you care. Results are not a printout at the desk.

Home: bag the device. Do not throw away the cannula or belts until you know the recording downloaded. If the center says the night was technically inadequate, that is a scheduling problem, not a personal one. Kapur’s strong recommendation is PSG next, not a second guess from a wearable.

Questions about the order, the arrival time, or whether your medicines change belong on the phone before the day of the test. Westerville Sleep Center is at (614) 898-9340. Appointment logistics are on the appointments page. Bring the instruction sheet you were given. If it conflicts with a paragraph here, the sheet that names your device wins.