Sleep Studies in China: Polysomnography for Insomnia and Apnoea

Why a Sleep Study, and Not Just a Pill

A software engineer in Shanghai told me he had been buying melatonin online for a year and still fell asleep in meetings. His wife said the snoring stopped his breathing for stretches she counted in seconds. That pattern, not the insomnia label, is what sends someone to a sleep lab. A polysomnography, or PSG, is an overnight recording of brain waves, breathing, heart rhythm and leg movement to catch sleep apnoea, narcolepsy and other disorders that a questionnaire misses. In China the test is widely available in tier-3 hospitals and dedicated sleep centres, and for a foreign resident it is one of the more comfortable investigations to sit through, with the broader Healthcare in China pathway making the booking straightforward.

This guide covers how the night works, who benefits, what it costs, and how to read the single number doctors care about most: the apnoea-hypopnoea index.

The Machine and the Wires

Despite the name, there is no radiation involved. The study is purely sensors. Electrodes on the scalp and face record brain and eye activity to stage sleep; bands around the chest and abdomen track breathing effort; a clip on the finger measures oxygen; small tubes at the nose and mouth measure airflow; and a microphone picks up snoring. A video camera watches body position. None of it hurts, and nothing is injected for a standard adult study.

Two formats exist. An in-lab PSG is the full overnight recording attended by a technician. A home sleep apnoea test, or HSAT, is a stripped-down version, usually just airflow, effort and oxygen, that you wear in your own bed. The lab study is fuller; the home kit is cheaper and easier but misses some diagnoses, especially narcolepsy and central apnoea.

Who Should Be Tested

The strongest signal is loud, habitual snoring with witnessed pauses in breathing, gasping, or choking at night, plus daytime sleepiness that affects work or driving. Other triggers are morning headaches, a dry mouth on waking, high blood pressure that resists medication, or a neck circumference above roughly 40 cm in men and 37 cm in women. Insomnia that does not improve with sleep hygiene, or sudden muscle weakness with emotion, a narcolepsy clue, also warrants a study.

Children are tested too, most often for suspected apnoea linked to enlarged tonsils or restless sleep and behavioural issues at school. Because the threshold for action is lower in kids, paediatric sleep clinics in major children’s hospitals run dedicated PSG lists. A broader look at who gets screened for sleep issues sits inside the sleep programme China overview if you want the full pathway.

Before You Go: The Prep That Matters

The rules are about cleaning and restraint, not fasting. Wash your hair the day of the test but skip conditioner, oil or styling products, because the scalp electrodes need a clean contact. Avoid caffeine after midday and skip the afternoon nap, since a restless first half of the night thins the data. No alcohol in the evening, as it suppresses the very breathing events the study is hunting. Bring your own loose pyjamas, a phone charger, and any regular sleep medication you take unless told otherwise.

For the small number of patients, usually young children who cannot lie still, a centre may use light sedation. That is a different risk profile and is decided case by case with the parents; for most adults the study is completely non-invasive. Pregnant women can safely undergo PSG because there is no radiation and no sedation in the standard protocol, though the technician positions wires to keep you comfortable as the pregnancy advances.

A Night in the Lab

You arrive around 9 pm, meet the technician, and they attach roughly 20 sensors with paste and tape over the next 45 minutes. Lights out follows your usual schedule. The room is a private bedroom, not a hospital bay, with a bathroom nearby. You can get up to use the toilet; the wires are long enough. The technician watches from a control room and can speak to you through an intercom. Most people sleep worse than at home but well enough, and the recording needs only a few solid hours to score. You are unplugged and out by 6 or 7 am.

How Long It Takes, Start to Finish

From referral to a lab night, public hospitals often run two to four weeks because sleep-lab slots are scarce and shared with neurology. Private clinics book in one to two weeks. The written report follows in three to seven working days. If a multiple sleep latency test is added the next day to confirm narcolepsy, plan to stay a second day. A home kit ships within days and you return it the next morning, with results in about a week.

What You Will Pay

Estimates only — final costs are determined by the hospital.

Public tier-3 hospital, in-lab PSG: roughly 800 to 2,000 RMB, about 110 to 280 USD.
Private sleep centre or international clinic, in-lab PSG: roughly 2,000 to 5,000 RMB, about 280 to 700 USD, often with an English-speaking technician.
Home sleep apnoea test, public or private: roughly 300 to 800 RMB, about 40 to 110 USD.
MSLT add-on for narcolepsy work-up: an extra 1,000 to 2,500 RMB, about 140 to 350 USD.
Titration night with a CPAP machine to find the right pressure: roughly 1,000 to 2,000 RMB, about 140 to 280 USD, extra.

Public pricing follows the provincial schedule and is the same for locals and foreigners. Insurers vary: some cover PSG as diagnostic when a doctor orders it for suspected apnoea, others treat it as investigational. Keep the referral note as proof.

Making Sense of the AHI

The apnoea-hypopnoea index counts breathing events per hour of sleep. Under 5 is normal. Mild apnoea is 5 to 15 events per hour, moderate is 15 to 30, and severe is above 30. Alongside it, the report notes the lowest blood-oxygen level reached and how long it stayed low; a dip below 80 percent for long stretches matters more than the raw count. The sleep staging also shows how little deep sleep you got, which explains the fatigue.

The Chinese report uses terms such as obstructive sleep apnoea and hypoxaemia. If the wording is dense, a translated and explained version helps before you act on it. Having your medical report translation China done by someone who knows the sleep terms prevents the common error of treating a mild label as nothing while the oxygen dips are actually significant. Severity guides treatment: mild often starts with weight loss, side-sleeping and alcohol changes; moderate to severe usually means a CPAP machine.

The Mistakes That Waste a Night

Using hair products so the scalp electrodes will not stick, forcing a redo.
Drinking coffee late or napping, which thins the recorded sleep and lowers data quality.
Assuming a home kit rules out narcolepsy; it only screens for apnoea.
Reading the AHI alone and ignoring the oxygen-lowering pattern.
Skipping the follow-up titration night when CPAP is recommended, then buying a machine at the wrong pressure.

Lab Test or Home Kit

Choose the in-lab PSG when the picture is unclear, when narcolepsy or central apnoea is suspected, or when a child is involved and a careful attended study is safer. Choose the home kit when straightforward snoring and daytime tiredness point at obstructive apnoea and you want a fast, cheap answer. Public hospitals lean toward the lab study; private clinics offer both and ship the home device quickly. Either way the result points to the same next step: lifestyle change, CPAP, or further neurology review. The wider context of how sleep fits into a health plan is worth reading before you book, because the test rarely stands alone.

Common Questions About Sleep Studies

Is the test safe if I am pregnant?

Yes. A standard PSG uses only sensors, no radiation and no sedation, so it is safe during pregnancy. The main adjustment is comfort, since the technician positions the wires and bands to accommodate a growing abdomen. If a sleep disorder is suspected, leaving it untreated carries more risk than the harmless study.

Will my child need anaesthesia?

Most children do the study awake and it is tolerated well, but very young or anxious children in some centres receive light sedation, which carries the usual fasting and monitoring requirements. Ask the paediatric sleep clinic directly about their policy before the night, and never assume it is drug-free.

Can I sleep with all those wires on?

Almost everyone does, just not as deeply. The technician only needs a few hours of scorable sleep, not a perfect night. People who worry they will not sleep at all usually produce enough data; the rare failed study is rescheduled rather than billed twice.

Does insurance cover it?

Coverage depends on the policy and the diagnosis code. A doctor-ordered study for suspected moderate to severe apnoea with a blood-pressure or accident history is more likely to be reimbursed than a self-requested screen. Keep the referral and the itemised invoice regardless.

A Note on Scope

This article explains how sleep studies are arranged for foreign residents in China and is for general education only, not personal medical advice. Whether you need a PSG and what the findings mean for your treatment must be decided by a physician who examines you. Karl Huang, Technical Director at Tianyou Medical Research Institute, certified health manager, Chinese medical companion specialist, and expert consultant at Zhong’an Kanghua Outpatient, wrote this from experience with international patients, but it does not replace a consultation. For the limits of this material, please read our medical disclaimer and our editorial policy.