Sleep Study in Singapore — WatchPAT & Polysomnography

What is a Sleep Study?

A sleep study (also called a polysomnogram, PSG, or simply "sleep test") is an overnight investigation that records what your body does while you sleep. The key signals are breathing pattern, blood oxygen level, heart rate, body position, snoring intensity, and — in full studies — brain wave activity (EEG), muscle activity (EMG), and eye movement (EOG) so the different stages of sleep can be scored.

Sleep studies are the gold-standard test for obstructive sleep apnea (OSA), the most common sleep disorder in Singapore. The 2016 SHAPE study estimated that around 30% of Singaporean adults have moderate-to-severe OSA, the majority undiagnosed. Untreated OSA is linked to hypertension, type 2 diabetes, atrial fibrillation, stroke, and a significantly higher motor vehicle accident risk — which is why diagnosis matters.

Two Types of Sleep Study

WatchPAT — Home Sleep Test

WatchPAT is a US FDA-cleared home sleep apnea test that uses Peripheral Arterial Tonometry (PAT) signal to detect apneas and hypopneas. It is a good fit for the majority of adults with suspected OSA who do not have other major medical conditions.

• Hardware: a wristwatch-style recorder, a finger probe, and a small chest sensor for snoring and body position
• Where: in your own bed, in your usual environment
• Duration: one overnight recording (usually 6+ hours of sleep)
• What it measures: AHI, oxygen desaturation index, heart rate, body position, snoring intensity, sleep stages (REM vs non-REM), and total sleep time
• Results: data is uploaded the next morning; a written report is generated within 1–2 days and reviewed with you in person
• Convenience: no overnight hospital stay, no electrode glue, sleep in your normal bed

Polysomnography (PSG) — In-Laboratory Sleep Study

PSG is the comprehensive gold-standard study performed in a sleep laboratory at Mt Elizabeth or affiliated facility. It is the more detailed option and is preferred in specific situations.

• Hardware: EEG (brain waves), EMG (chin and leg muscle activity), EOG (eye movement), ECG, nasal cannula and thermistor (airflow), chest and abdominal belts (breathing effort), pulse oximetry, snoring microphone, and infrared video
• Where: in a private bedroom in the sleep laboratory, supervised overnight by a sleep technologist
• Duration: one overnight study, usually arrival around 9 pm and departure 6–7 am
• What it adds over WatchPAT: distinguishes obstructive vs central sleep apnea, characterises sleep architecture, picks up periodic limb movements and parasomnias, and can be combined with CPAP titration
• When it is preferred: children, suspected central sleep apnea, significant heart or lung disease, complex sleep complaints, and CPAP titration studies

When Should You Have a Sleep Study?

Consider a sleep study if you have any of the following:

• Loud habitual snoring with witnessed pauses in breathing reported by your bed partner
• Choking, gasping, or snorting awakenings
• Excessive daytime sleepiness — Epworth Sleepiness Scale score above 10
• Morning headaches or a dry, sore mouth on waking
• Unrefreshing sleep despite spending 7+ hours in bed
• Difficult-to-control hypertension, atrial fibrillation, or type 2 diabetes
• Falling asleep while driving or at work meetings
• Pre-operative assessment before bariatric surgery, jaw surgery, or major surgery in patients at high risk of OSA
• Children with persistent snoring, restless sleep, mouth breathing, or behavioural issues that may be sleep-driven

Understanding Your Results — The AHI

The most important number on the report is the Apnea-Hypopnea Index (AHI) — the average number of apneas (complete breathing stoppages of 10+ seconds) plus hypopneas (partial breathing reductions with oxygen drop or arousal) per hour of sleep.

What Happens After Diagnosis?

The treatment recommendation depends on AHI severity, body shape, upper airway examination, and your preferences:

• Lifestyle modification — weight loss (10% body weight reduction can reduce AHI by 25–50%), sleeping on your side, avoiding alcohol within 4 hours of sleep, smoking cessation, and treating nasal obstruction
• Continuous Positive Airway Pressure (CPAP) — the most effective treatment for moderate-to-severe OSA. Modern auto-titrating machines are quiet and well-tolerated by most patients.
• Mandibular advancement device (MAD) — a custom-fitted dental appliance that advances the lower jaw to keep the airway open. Suitable for mild-to-moderate OSA and snoring.
• Surgical options — uvulopalatopharyngoplasty (UPPP), tonsillectomy (especially in children), septoplasty, turbinate reduction, and multilevel airway surgery for selected patients with identifiable anatomical narrowing
• Treating contributing conditions — allergic rhinitis, deviated septum, and turbinate hypertrophy all worsen sleep apnea by reducing nasal airflow. See allergic rhinitis, deviated septum, and turbinate hypertrophy.

Read more about snoring and sleep apnea for the full overview.

How Much Does a Sleep Study Cost in Singapore?

• WatchPAT home sleep test: S$300–S$500
• Type 1 in-laboratory PSG (private hospital): S$800–S$1,500 depending on facility
• Insurance: Most Integrated Shield Plans cover sleep studies when ordered by a specialist
• Medisave: Sleep studies are not generally claimable as a stand-alone diagnostic test, but Medisave may apply when the study is part of an inpatient surgical work-up. Our clinic team will advise based on your specific situation.

Why Choose Dr Pang to Interpret Your Sleep Study?

• Sub-specialty interest in snoring and sleep apnea, with over 20 years of ENT experience across the United Kingdom, United States, and Singapore
• Former Senior Consultant and Clinical Director, NUH Department of Otolaryngology
• Established the Image Guided Surgery Program at NUH — directly relevant when surgical airway treatment is considered
• WatchPAT home tests dispensed and collected directly from the clinic, with results reviewed in person at follow-up
• In-laboratory PSG arranged at Mt Elizabeth or partner sleep laboratory when the more detailed study is needed
• Treatment of any contributing nasal condition (allergic rhinitis, septal deviation, turbinate hypertrophy, polyps) handled in the same clinic

Frequently Asked Questions