The STOP-BANG Questionnaire Explained
Eight simple questions that predict your sleep apnea risk with surprising accuracy. Here's what each letter means and how to interpret your score.
Evidence-based articles written and reviewed by our board-certified sleep medicine physicians.
Nearly 30 million Americans have sleep apnea and don't know it. Here's everything you need to understand about what it is, how it affects your body, and what you can do about it — explained without the medical jargon.
Read the full guide →Nearly 30 million Americans have obstructive sleep apnea — and roughly 80% of them have no idea. If you've ever been told you snore, woken up feeling like you didn't sleep at all, or found yourself nodding off in the afternoon despite a full night in bed, this guide is for you.
Sleep apnea is a disorder in which your breathing repeatedly stops and starts during sleep. The word "apnea" comes from the Greek word for "without breath." These breathing pauses — called apneic events — can last anywhere from a few seconds to more than a minute, and they can happen dozens or even hundreds of times per night.
The most common type, obstructive sleep apnea (OSA), occurs when the muscles in the back of your throat relax too much during sleep, causing your airway to narrow or close entirely. When that happens, your brain senses the drop in oxygen and briefly rouses you from sleep — just enough to reopen the airway. You usually don't remember these awakenings, but they shatter the quality of your sleep regardless.
"The average person with moderate-to-severe sleep apnea experiences 15 to 30 breathing interruptions every single hour of sleep — often without any awareness that this is happening."
Obstructive Sleep Apnea (OSA) is by far the most common — accounting for approximately 84% of all cases. It occurs when throat muscles physically block the airway. Most home sleep tests are designed specifically to detect OSA.
Central Sleep Apnea (CSA) is less common and occurs when the brain fails to send proper signals to the muscles that control breathing. It's often associated with heart failure, stroke, or opioid use. Home sleep tests cannot reliably detect CSA — an in-lab study is required.
Complex Sleep Apnea Syndrome (also called treatment-emergent CSA) appears in some patients who are initially diagnosed with OSA but develop central apneas when treated with CPAP therapy.
Sleep apnea can affect anyone — including children — but certain factors significantly raise your risk:
The most surprising thing about sleep apnea is that most of its symptoms occur during waking hours — not at night. The nighttime symptoms (snoring, gasping) are often noticed by a bed partner long before the patient suspects anything. Common signs include:
The Apnea-Hypopnea Index (AHI) is the primary metric used to diagnose and grade the severity of sleep apnea. It measures the average number of breathing disruptions per hour of sleep. Your Remful report will include your AHI score, interpreted as follows:
A Remful at-home sleep study delivers your AHI score, SpO₂ levels, and a physician-signed report in 48 hours — all for $249.
Order Your Sleep Study →Untreated sleep apnea is far more dangerous than most people realize. Each apneic event forces your body into a brief stress response — heart rate spikes, blood pressure surges, and oxygen levels drop. Over time, these nightly micro-crises accumulate into serious long-term health risks:
The good news? Treatment is highly effective. Most patients on CPAP therapy report dramatic improvement in energy, mood, and cognitive function within the first few weeks — and long-term treatment significantly reduces cardiovascular risk.
Most people think sleep apnea announces itself with dramatic snoring and gasping. In reality, many of the most telling signs show up during the day — and millions of people dismiss them as normal tiredness or stress. Here are 10 warning signs worth taking seriously.
If you're getting 7–8 hours but still feel exhausted, this is the single most important warning sign. People with untreated OSA never reach the deep, restorative stages of sleep — every apnea event pulls them back toward wakefulness, fragmenting their sleep cycle all night long.
Habitual snoring — especially snoring that includes pauses, gasps, or choking sounds — is present in the majority of OSA patients. Not everyone who snores has sleep apnea, but almost everyone with OSA snores.
Waking up with a headache several mornings a week is strongly associated with sleep apnea. These "sleep apnea headaches" are caused by elevated carbon dioxide levels in the blood during apneic events and typically resolve within an hour of waking.
If a bed partner has witnessed you gasping, choking, or making snorting sounds during sleep — or if you've ever woken yourself up gasping — this is one of the most specific indicators of OSA and warrants immediate evaluation.
The Epworth Sleepiness Scale asks about your likelihood of dozing off in situations like reading, watching TV, sitting in a car, or talking to someone. Scores above 10 suggest significant daytime sleepiness requiring evaluation.
Cognitive impairment from sleep fragmentation can look like ADHD, early dementia, or depression. Many patients report that their mental clarity improved dramatically after starting CPAP — the "brain fog" was sleep apnea all along.
Sleep deprivation profoundly affects emotional regulation. OSA has a well-documented association with depression and anxiety — and treatment of OSA often produces significant improvement in mood, independent of antidepressant therapy.
Waking to urinate two or more times per night (nocturia) is common in OSA patients. The mechanism is complex — apnea events trigger the release of atrial natriuretic peptide, which increases urine production. Many patients report that treating OSA eliminates their nocturia entirely.
Approximately 50% of people with hypertension have OSA. If your blood pressure is difficult to control despite medication, sleep apnea should be ruled out — it's one of the most common and under-recognized causes of resistant hypertension.
Waking consistently with a dry mouth or sore throat suggests you're breathing through your mouth during sleep — a common compensation for a partially obstructed airway. It often co-occurs with snoring and is associated with OSA.
An at-home Remful sleep study can tell you definitively whether sleep apnea is the cause — in 48 hours, from the comfort of your own bed.
Order Your Sleep Study — $249 →A decade ago, if your doctor suspected sleep apnea, there was only one option: spend a night in a sleep lab wired head-to-toe with electrodes while a technician watched you from the other side of a glass wall. Today, home sleep testing has been validated by multiple clinical studies and endorsed by the American Academy of Sleep Medicine as an appropriate and accurate diagnostic tool for most patients with suspected OSA.
A high-quality home sleep test (HST) measures the key parameters needed to diagnose obstructive sleep apnea: respiratory airflow, respiratory effort (chest wall movement), blood oxygen saturation (SpO₂), heart rate, and body position. Remful's contactless system captures these without any sensors attached to your body.
Polysomnography (PSG) is the comprehensive gold standard. In addition to all HST parameters, it also measures brain waves (EEG for sleep staging), eye movements (EOG), muscle activity (EMG), and is supervised by a trained technologist who can intervene if needed.
According to AASM guidelines, a home sleep test is appropriate for adults who have a high pre-test probability of moderate-to-severe OSA and no significant comorbidities. Specifically, HST is well-suited for patients who snore and have two or more of the following: witnessed apneas, daytime sleepiness, hypertension, or are male and over 50 with a BMI over 35.
Some patients need the full in-lab evaluation. These include patients suspected of having central sleep apnea or complex sleep apnea, those with significant cardiac or pulmonary disease, neuromuscular disorders, chronic opioid use, or prior CPAP failure. If your Remful results are inconclusive or suggest central apneas, we will recommend an in-lab follow-up.
Remful's physician intake process screens for contraindications and will let you know if an in-lab study is more appropriate for your situation.
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