Sleep Apnea: Could You Have It? Signs, Risks & What to Do Next

Sleep apnea is one of the most prevalent — and most overlooked — sleep disorders in the world. According to research published in the American Journal of Epidemiology, approximately 26% of adults between the ages of 30 and 70 have sleep apnea. More concerning: it's estimated that up to 80% of cases remain undiagnosed. That means the vast majority of people living with the condition have no idea it's happening to them every night.

The consequences extend well beyond feeling tired. Untreated sleep apnea is independently associated with elevated blood pressure, increased cardiovascular risk, metabolic dysfunction, cognitive impairment, and a significantly elevated risk of motor vehicle accidents. Understanding the warning signs — and knowing what to do about them — can be genuinely life-changing.

What Is Sleep Apnea?

Sleep apnea is a condition in which breathing repeatedly stops and restarts during sleep. These pauses — called apneas — can last from a few seconds to over a minute and may occur dozens or even hundreds of times per night. Each event partially rouses the brain from sleep to restore breathing, fragmenting sleep architecture in ways the person is typically unaware of.

There are two primary types:

Obstructive Sleep Apnea (OSA)

By far the more common form, obstructive sleep apnea occurs when the muscles at the back of the throat relax during sleep, causing the soft tissue — the tongue, soft palate, and uvula — to collapse and partially or fully block the airway. The brain detects falling oxygen levels and triggers a brief arousal to restart breathing, often accompanied by a snort, gasp, or choking sound. The person rarely wakes fully and usually has no memory of the events in the morning.

Central Sleep Apnea (CSA)

Central sleep apnea involves a different mechanism: the airway isn't physically blocked, but the brain fails to send proper signals to the muscles that control breathing. CSA is less common and is often associated with underlying conditions such as heart failure, stroke, or the use of certain opioid medications. Treatment approaches differ from those used for OSA.

Warning Signs of Sleep Apnea

Because sleep apnea occurs during unconsciousness, many of its most direct signs are observed by a bed partner rather than the person with the condition. Others manifest during waking hours as downstream consequences of fragmented, non-restorative sleep.

Loud, Chronic Snoring

Not everyone who snores has sleep apnea, and not everyone with sleep apnea snores — but loud, habitual snoring is the single most common symptom. The sound is produced by the vibration of partially obstructed airway tissue. Snoring that is loud enough to be heard through walls, or that is accompanied by pauses in breathing, is particularly indicative.

Gasping or Choking During Sleep

Episodes of gasping, snorting, or choking — especially if witnessed by a partner — are a strong clinical indicator of OSA. These sounds represent the body's effort to overcome airway obstruction. A partner who describes watching you stop breathing, even briefly, warrants prompt medical evaluation.

Excessive Daytime Sleepiness

Falling asleep at inappropriate times — in meetings, while reading, watching TV, or most critically, while driving — is one of the most functionally impairing consequences of sleep apnea. The Epworth Sleepiness Scale (ESS) is a validated questionnaire doctors use to quantify daytime sleepiness; a score of 10 or above is considered clinically significant and a score above 16 indicates severe daytime sleepiness.

Morning Headaches

Recurrent morning headaches that improve within an hour or two of waking are frequently reported by people with sleep apnea. They are thought to result from overnight hypoxia (reduced oxygen) and hypercapnia (elevated CO2), which cause cerebral vasodilation. If you consistently wake with a dull, pressure-type headache, sleep apnea is a condition worth ruling out.

Waking Unrefreshed

Feeling as though you barely slept despite spending seven or eight hours in bed is a hallmark of non-restorative sleep. Sleep apnea disrupts the normal progression through sleep stages, in particular suppressing deep slow-wave sleep and REM sleep. You may achieve the quantity of sleep but not the quality, leaving you cognitively impaired and physically depleted each morning.

Nocturia (Waking to Urinate)

Waking frequently to use the bathroom at night — particularly more than twice — is a less commonly known symptom of sleep apnea. The apneic arousals trigger the release of atrial natriuretic peptide, a hormone that signals the kidneys to produce more urine. Many people treated for nocturia for years find that effective sleep apnea treatment resolves the problem entirely.

Cognitive and Mood Symptoms

Difficulty concentrating, memory problems, increased irritability, and symptoms that mimic depression or anxiety can all result from untreated sleep apnea. If you've noticed these changes and sleep-related explanations haven't been explored, sleep apnea warrants consideration.

Risk Factors

While sleep apnea can affect anyone — including children — several factors significantly increase the likelihood:

• Body weight: Excess weight, particularly around the neck and upper airway, is the single strongest modifiable risk factor for OSA. Even a 10% weight gain can increase the risk of OSA by approximately 32%.
• Neck circumference: A neck circumference greater than 17 inches (43 cm) in men or 16 inches (41 cm) in women is associated with increased airway narrowing risk.
• Age: The prevalence of sleep apnea increases with age, partly due to reduced muscle tone in the upper airway.
• Sex: Men are diagnosed with sleep apnea roughly twice as often as women, though the gap narrows after menopause. Women often present with atypical symptoms (fatigue, insomnia, depression) rather than classic snoring, contributing to underdiagnosis.
• Alcohol and sedatives: Alcohol relaxes upper airway musculature and can trigger or worsen obstructive events, particularly when consumed within a few hours of sleep.
• Anatomical factors: A naturally narrow airway, enlarged tonsils or adenoids, a recessed jaw (retrognathia), or nasal obstruction all increase OSA risk independent of body weight.
• Family history: Sleep apnea has a heritable component; having a first-degree relative with the condition roughly doubles your risk.

Self-Assessment Checklist

Use the checklist below as a starting point for personal reflection. This is not a clinical diagnostic tool, but it mirrors the STOP-BANG questionnaire commonly used in medical settings. If you check three or more items, discussing evaluation with your doctor is advisable. Five or more checks suggests high risk.

• ☐ I snore loudly (loud enough that others can hear through a closed door, or my partner has complained)
• ☐ I often feel tired, fatigued, or sleepy during the daytime despite a full night's sleep
• ☐ Someone has observed me stop breathing, gasp, or choke during sleep
• ☐ I have been told I have high blood pressure, or I am currently being treated for it
• ☐ My BMI is greater than 35
• ☐ I am 50 years of age or older
• ☐ My neck circumference is greater than 40 cm (about 16 inches)
• ☐ I am male
• ☐ I regularly wake with a headache in the morning
• ☐ I wake up two or more times per night to use the bathroom
• ☐ I find it hard to concentrate, or my memory has noticeably worsened
• ☐ I have fallen asleep while driving, or have come dangerously close to doing so

Diagnosis: Sleep Studies Explained

Sleep apnea can only be formally diagnosed through a sleep study, called a polysomnogram (PSG). Two formats are available:

In-Lab Polysomnography

The gold standard, conducted overnight in a sleep center. Sensors monitor brain activity (EEG), eye movements, muscle activity, heart rhythm, breathing effort, airflow, oxygen saturation, and limb movements. A sleep technician monitors the study in real time. Results are scored and interpreted by a board-certified sleep physician. This comprehensive approach is preferred for cases where a simpler home test is inconclusive, where central sleep apnea or other sleep disorders are suspected, or in patients with complex medical histories.

Home Sleep Apnea Testing (HSAT)

For uncomplicated cases of suspected moderate-to-severe OSA, home testing devices are now widely used. They typically measure airflow, respiratory effort, oxygen saturation, and heart rate. Home tests are simpler, more comfortable, and less expensive, and are now covered by most insurance plans in the United States for appropriate clinical indications. They are not suitable for diagnosing central sleep apnea and may underestimate severity in some patients.

The key diagnostic metric is the Apnea-Hypopnea Index (AHI): the average number of breathing events per hour of sleep. An AHI of 5–15 indicates mild OSA; 15–30 indicates moderate OSA; above 30 indicates severe OSA.

Treatment Options

CPAP Therapy

Continuous Positive Airway Pressure (CPAP) therapy is the most effective treatment for moderate-to-severe OSA. The device delivers a steady stream of pressurized air through a mask during sleep, acting as a pneumatic splint that holds the airway open throughout the night. Properly used, CPAP eliminates apneic events in most patients and produces rapid, dramatic improvements in daytime alertness, blood pressure, cognitive function, and overall quality of life.

The challenge with CPAP is adherence. Studies suggest roughly 50% of patients prescribed CPAP use it less than four hours per night — the threshold below which benefits diminish significantly. Modern CPAP machines are quieter, smaller, and more comfortable than earlier generations, and many include auto-titrating pressure (APAP) that adjusts throughout the night. Mask fit is critical: if your current mask is uncomfortable, exploring different styles (nasal pillow, nasal, full face) with a sleep equipment provider can transform tolerability.

Oral Appliance Therapy

Custom-fitted mandibular advancement devices (MADs), made by a dentist trained in sleep medicine, reposition the lower jaw slightly forward during sleep, which opens the upper airway. They are less effective than CPAP for severe OSA but often better tolerated, particularly for travel. They are a first-line option for mild to moderate OSA and for patients who cannot tolerate CPAP.

Positional Therapy

Many people with OSA have position-dependent apnea — events occur predominantly when sleeping on the back (supine position), because gravity allows the tongue and soft palate to fall backward more easily. For these individuals, avoiding back sleeping through positional devices or strategically placed pillows can substantially reduce AHI. This is rarely sufficient as a standalone treatment for moderate-to-severe OSA but can complement other therapies.

Weight Loss

For overweight or obese patients, meaningful weight loss reliably reduces OSA severity. A 10–15% reduction in body weight can reduce AHI by approximately 30–50% in some patients. Bariatric surgery in patients with severe obesity has produced remission of OSA in a significant proportion of cases. Weight loss alone is rarely sufficient for severe OSA, but it is among the most impactful lifestyle modifications available.

Surgical Options

Surgical interventions for OSA range from procedures addressing specific anatomical obstructions (septoplasty for a deviated septum, tonsillectomy for enlarged tonsils) to palate-stiffening procedures and, more recently, hypoglossal nerve stimulation (Inspire therapy) — an implanted device that stimulates the tongue muscles to maintain airway patency during sleep. Surgery is typically reserved for patients who cannot tolerate CPAP or for whom specific anatomical factors make it appropriate. Success rates vary considerably by procedure and patient selection.

When to See a Doctor Immediately

While most sleep apnea cases are chronic conditions requiring standard referral pathways, seek urgent medical attention if you experience any of the following: falling asleep while driving or operating heavy machinery; oxygen saturation dips that cause you to wake gasping repeatedly throughout the night; new or worsening cardiovascular symptoms (chest pain, palpitations, shortness of breath) in combination with suspected sleep apnea; or severe morning headaches with confusion. These scenarios suggest potentially dangerous levels of nocturnal hypoxia or cardiovascular stress that warrant prompt evaluation.