Signs of Sleep Apnea in Adults: What to Look For and When to Get Tested

What is obstructive sleep apnea?

Obstructive sleep apnea (OSA) happens when the muscles of the upper airway relax too much during sleep, causing the throat to narrow or fully collapse. Breathing briefly stops — sometimes for ten seconds, sometimes longer. The brain detects the oxygen drop, triggers a brief arousal, and breathing resumes, often with a gasp or snort. The person almost never fully wakes, so they rarely remember these events.

This cycle can repeat dozens or even hundreds of times per night. The result is severely fragmented sleep, repeated drops in oxygen, and a cardiovascular and metabolic stress response that accumulates over time. OSA exists on a spectrum: mild OSA may cause few noticeable symptoms, while severe OSA carries real long-term consequences for heart health, blood pressure, metabolic function, cognitive performance, and mood 1Ref 1Kapur VK, Auckley DH, Chowdhuri S, et al. (2017).Clinical Practice Guideline for Diagnostic Testing for Adult Obstructive Sleep Apnea: An American Academy of Sleep Medicine Clinical Practice Guideline.OSA signs, diagnosis, home sleep apnea testing as first-line, AHI thresholds, and cardiovascular consequences.

What are the main signs to watch for?

Loud habitual snoring: Not all snorers have sleep apnea, but loud snoring that happens almost every night in all sleep positions — punctuated by silence, then a snort or gasp — is the most common presenting sign.

Witnessed breathing pauses: If a partner, family member, or roommate has observed that you stop breathing during sleep, that observation is clinically significant and should be shared with a clinician 1Ref 1Kapur VK, Auckley DH, Chowdhuri S, et al. (2017).Clinical Practice Guideline for Diagnostic Testing for Adult Obstructive Sleep Apnea: An American Academy of Sleep Medicine Clinical Practice Guideline.OSA signs, diagnosis, home sleep apnea testing as first-line, AHI thresholds, and cardiovascular consequences.

Gasping or choking awake: Some people fully rouse from apnea events, often startled and with a racing heart. This is more common in severe OSA.

Excessive daytime sleepiness: Falling asleep in meetings, while watching TV, or — dangerously — while driving is a red flag. People with OSA often do not recognize how impaired their alertness has become because they have adapted over time.

Morning headaches: Repeated low oxygen during the night can cause headaches that are present on waking and fade within an hour or so.

Waking frequently to urinate (nocturia): The repeated micro-arousals can trigger hormonal signals that increase urine production. This often improves significantly with OSA treatment.

Unrefreshing sleep and mood changes: Feeling tired despite a full night in bed, along with impaired concentration, memory difficulties, and worsened mood, are consistent with chronically fragmented, oxygen-compromised sleep.

Who is at higher risk?

While sleep apnea can affect anyone, several factors raise the likelihood considerably:

• Overweight or obesity: The strongest modifiable risk factor — excess tissue around the neck narrows the airway
• Male sex: Men develop OSA at roughly twice the rate of premenopausal women; after menopause, women's rates approach men's
• Age: Airway muscle tone decreases with age, making OSA more common in older adults 2Ref 2National Institute on Aging (2023).Sleep and Older Adults.Age-related decline in airway muscle tone increasing OSA risk in older adults
• Large neck circumference: Often cited thresholds are 17 inches for men and 16 inches for women
• Upper-airway anatomy: Naturally narrow throat, enlarged tonsils, or a recessed jaw can predispose someone regardless of weight
• Alcohol and sedatives: Relax airway muscles and worsen OSA
• Hypothyroidism: Can affect soft tissue and contribute to airway obstruction

What happens if sleep apnea goes untreated?

OSA is not only a nuisance. Moderate-to-severe OSA that goes untreated over time is associated with high blood pressure that can be resistant to medication, increased cardiovascular risk including heart attack and stroke, Type 2 diabetes and insulin resistance, cognitive decline, depression and anxiety, and motor vehicle accidents from sleepiness 1Ref 1Kapur VK, Auckley DH, Chowdhuri S, et al. (2017).Clinical Practice Guideline for Diagnostic Testing for Adult Obstructive Sleep Apnea: An American Academy of Sleep Medicine Clinical Practice Guideline.OSA signs, diagnosis, home sleep apnea testing as first-line, AHI thresholds, and cardiovascular consequences3Ref 3Pintilie AL, Marcu DTM, Zabara-Antal A, et al. (2025).Sleep Apnea: The Slept-Upon Cardiovascular Risk Factor.OSA found in 40–80% of cardiovascular clinic patients; meta-analyses link OSA to nearly twice the risk of cardiovascular disease and mortality; mechanisms include intermittent hypoxia, sympathetic activation, and endothelial dysfunction.

A 2025 review found that OSA is present in 40–80% of patients in cardiovascular clinics and is linked to nearly twice the risk of cardiovascular disease and mortality in meta-analyses 3Ref 3Pintilie AL, Marcu DTM, Zabara-Antal A, et al. (2025).Sleep Apnea: The Slept-Upon Cardiovascular Risk Factor.OSA found in 40–80% of cardiovascular clinic patients; meta-analyses link OSA to nearly twice the risk of cardiovascular disease and mortality; mechanisms include intermittent hypoxia, sympathetic activation, and endothelial dysfunction. The NHLBI identifies untreated sleep apnea as increasing the risk of stroke and heart attack 4Ref 4National Heart, Lung, and Blood Institute (2024).What Is Sleep Apnea?.Untreated sleep apnea increases risk of stroke and heart attack; CPAP and lifestyle modifications are standard treatments.

CPAP (Continuous Positive Airway Pressure) is the gold-standard treatment for moderate-to-severe OSA. Effective treatment consistently improves daytime alertness, blood pressure control, mood, and quality of life.

How is sleep apnea diagnosed?

The gold standard is an in-laboratory polysomnography (PSG). For most adults with suspected OSA, however, a home sleep apnea test (HSAT) — a small device worn at home for one or two nights — is a convenient and accurate first-line alternative that a primary care clinician can order 1Ref 1Kapur VK, Auckley DH, Chowdhuri S, et al. (2017).Clinical Practice Guideline for Diagnostic Testing for Adult Obstructive Sleep Apnea: An American Academy of Sleep Medicine Clinical Practice Guideline.OSA signs, diagnosis, home sleep apnea testing as first-line, AHI thresholds, and cardiovascular consequences.

The test measures breathing effort, airflow, oxygen levels, and body position. Results are interpreted by a sleep physician who calculates the Apnea-Hypopnea Index (AHI) — the number of breathing events per hour. This number determines whether OSA is absent, mild, moderate, or severe and guides treatment decisions.

A negative home test in someone with high clinical suspicion may still prompt an in-lab study, since home tests can miss central apnea and some positional apnea.