Even If You Don't Snore: Who Should Get Tested for Sleep Apnea

Originally written in Korean and adapted for international readers.

Snoring, or "stopping breathing" in your sleep, is usually something someone else tells you about — not something you notice yourself. So if you sleep alone, aren't a snorer, or your partner doesn't pick up on it — sleep apnea can slip by unnoticed, even when it's severe. This piece lays out the signs and situations that should make you suspect sleep apnea and consider getting tested, even if you don't snore.

Why not snoring is no reassurance

Sleep apnea severity is usually graded by how many times per hour breathing stops or grows shallow (the apnea–hypopnea index, AHI). But the link between that number and what a patient actually feels is weaker than you'd think. In one analysis of newly diagnosed patients, the scores for sleepiness, sleep quality, depression, and anxiety all showed no meaningful correlation with AHI. On a scale where 0 means no relationship and 1 means a perfect match, even the strongest symptom score reached only 0.18 — essentially unrelated. Body mass index (BMI) was the one thing meaningfully correlated with AHI (0.33)^[1]. In plain terms, your test number can be high while you barely feel a thing.

"Sleep apnea is the disease that makes you sleepy in the daytime" is only half true. Sleepiness is often named as the hallmark symptom, but in this study the degree of sleepiness (ESS) had no correlation with the apnea index, and the average apnea index was no different between sleepy and non-sleepy people^[1]. No daytime sleepiness does not mean no apnea.

Even people who know they snore often never get diagnosed. Recent estimates put roughly 936 million adults aged 30–69 worldwide with at least mild sleep apnea — and even in developed countries with good access to care, most remain undiagnosed and untreated^[2]. And because the apnea itself happens while you're asleep, you can't perceive it directly — it's confirmed only by a witness or a sleep study.

Signs you can notice yourself

Saying the number (AHI) and the symptoms run on separate tracks cuts both ways: mild symptoms are no reason to relax, but it doesn't make symptoms meaningless either. The signs below aren't a way to diagnose apnea or grade its severity — think of them as clues for deciding whether to get tested. If snoring and witnessed apneas are what a bed partner sees, these are what you can feel yourself.

• You wake up unrefreshed even after a full night
• Daytime sleepiness or chronic fatigue
• Waking to urinate two or more times a night (nocturia)
• Waking up gasping or choking
• Fragmented, light sleep, or trouble falling asleep (insomnia)
• Morning headaches
• A dry mouth or sore throat on waking
• Trouble concentrating, memory lapses, or brain fog
• Low mood, anxiety, or irritability for no clear reason

Women in particular tend to present this way rather than with snoring. In a study comparing male and female sleep apnea patients, women reported morning headache (50.0% vs 28.4%), depressive mood (49.0% vs 19.5%), and restless legs symptoms more often than men, along with more fatigue and nocturia^[3]. Women are also less likely to acknowledge that they snore at all. In a study of patients referred for sleep testing, 28% of women called themselves non-snorers versus 6.9% of men — yet 36.5% of the self-described non-snoring women actually snored heavily^[4]. So sleep apnea in women is easily mistaken for insomnia, fatigue, or depression.

"I'm not overweight, so I'm fine" — a risky assumption, especially for Asian patients

Sleep apnea is widely thought of as a heavy person's disease, but for East Asians the picture is a little different. At the same level of obesity, East Asians tend to have more severe apnea because of a smaller jaw and a narrower airway. In a study comparing Caucasian and Chinese patients, at a similar BMI the Chinese patients had more severe apnea and smaller craniofacial bone structure^[5]. That's why a WHO expert consultation concluded that Asian populations are already at elevated diabetes and cardiovascular risk at a lower BMI than the existing Western cutoffs, and proposed BMI 23 as an additional 'at risk' trigger point^[6]. Reflecting this, the Asia-Pacific region commonly treats 23 as overweight and 25 as obese.

Korean data bear this out. In a study of 383 Koreans tested on suspicion of sleep apnea, the BMI suggestive of sleep apnea was about 23 for women and 25 for men, and the neck-circumference threshold was about 34.5 cm for women and 38.75 cm for men — far below the 43 cm (men) neck circumference commonly used in the US^[7]. In other words, you can have sleep apnea even with a lean build and a not-especially-thick neck.

When these conditions are present, consider testing even without snoring

Sleep apnea is especially common in people with cardiovascular disease. Prevalence has been reported at 40–80% in patients with hypertension, heart failure, coronary artery disease, pulmonary hypertension, atrial fibrillation, and stroke^[8]. So if any of the following apply, consider testing even without snoring.

• Hypertension that's hard to control on medication (especially resistant hypertension)
• Arrhythmia such as atrial fibrillation (especially when it recurs after a procedure or cardioversion)
• Type 2 diabetes, metabolic syndrome
• A history of stroke or transient ischemic attack
• Heart failure (with breathlessness), coronary artery disease
• Before bariatric surgery

The American Heart Association recommends screening for sleep apnea in patients with poorly controlled hypertension, pulmonary hypertension, or atrial fibrillation that recurs after a procedure^[8].

And this is not a rare condition. In the US, an estimated 13% of men and 6% of women aged 30–70 have moderate-to-severe sleep apnea^[9], and about 26% have at least mild sleep-disordered breathing^[9] — yet most of them have never been diagnosed.

A screening tool: STOP-Bang

When you want to quickly gauge sleep apnea risk, the screening tool used widely in clinical practice is STOP-Bang. It was developed and validated in surgical patients by Chung et al. at the University Health Network (UHN) in Toronto, adding body mass index, age, neck circumference, and sex to the original four STOP items^[10]. It scores eight things — snoring, daytime tiredness, observed apnea, and high blood pressure (STOP), plus BMI, age, neck circumference, and male sex (Bang) — and a score of 3 or more is usually treated as high risk.

To score yourself — STOP-Bang Score calculator (MDCalc) →

STOP-Bang is strong at not missing cases. In a meta-analysis of surgical patients, at a cutoff of 3 the sensitivity was 85% for all OSA, 88% for moderate-to-severe, and 90% for severe^[11]. But a positive screen is not a diagnosis, and a negative screen is not the all-clear. The BMI and neck-circumference items in particular use Western thresholds, so a lean Asian patient can score low and still have sleep apnea — as we saw, sleep apnea develops at a lower BMI and neck circumference in Asian populations^[7].

How testing works

Sleep apnea is diagnosed by a sleep study, not by symptoms. For an uncomplicated adult with signs that point to a high risk of moderate-to-severe sleep apnea, a home sleep apnea test (HSAT) with an adequate device is a reasonable option, alongside in-lab polysomnography^[12]. But if you have significant heart or lung disease — or neuromuscular weakness, chronic opioid use, a history of stroke, or severe insomnia — an in-lab study is recommended over a home test^[12]. And if a home test comes back negative, inconclusive, or technically inadequate, the next step is in-lab polysomnography^[12].

If several of the signs above overlap, it's worth seeing a sleep clinic even if you don't snore.

This article is general information, not individual medical advice. Talk to a sleep specialist about your own symptoms and history.