Sleep apnea explained: symptoms, risks, and treatment options

What sleep apnea is

Sleep apnea is a sleep-related breathing disorder. During sleep, breathing repeatedly stops (an apnea) or becomes much shallower (a hypopnea) for ten seconds or longer, many times a night. Each event tends to end with a brief arousal — usually too short to remember — which fragments sleep and stresses the heart and blood vessels.

Obstructive vs. central sleep apnea

• Obstructive sleep apnea (OSA) is by far the most common type. The muscles of the throat relax during sleep and the airway narrows or closes, even though the body keeps trying to breathe.
• Central sleep apnea (CSA) is less common. The airway is open, but the brain’s signal to breathe pauses. It is more often seen with heart failure, certain medications (including long-term opioids), or after a stroke.

Signs and symptoms to notice

Many people with sleep apnea have no idea their breathing is interrupted. The clues often come from a partner, or from how the days feel:

• Loud, regular snoring — especially with pauses, snorts, or gasping
• Waking with a dry mouth, sore throat, or headache
• Feeling unrefreshed after a full night’s sleep
• Daytime sleepiness, dozing off while reading, watching TV, or driving

If you have dozed off, or nearly dozed off, while driving, do not drive until you have been assessed, and see a doctor promptly. Sleepiness at the wheel is the symptom of sleep apnea that matters most for safety.

• Difficulty concentrating, irritability, or low mood
• Waking often to urinate

Not everyone snores loudly, and women and older adults in particular may notice fatigue, insomnia, or mood changes more than the classic signs.

Who is more likely to have it

Sleep apnea can affect anyone, including children, but it is more common with excess body weight, a larger neck circumference, a narrow airway or large tonsils, male sex, older age, a family history, smoking, alcohol use in the evening, and nasal congestion. Being at risk does not mean you have it; it means a conversation with your doctor is reasonable if symptoms are present.

Why untreated sleep apnea matters

Repeated oxygen dips and arousals do more than make you tired. Untreated moderate-to-severe sleep apnea is associated with high blood pressure, heart rhythm problems, heart disease and stroke, type 2 diabetes, and a higher risk of motor-vehicle and workplace accidents from sleepiness. Treatment reliably improves sleepiness, quality of life and blood pressure and lowers crash risk; whether it prevents heart attacks and strokes is still being studied — the largest randomised trial so far (SAVE, 2016) did not show that CPAP prevented them in people with existing heart disease. The strongest reasons to get tested are how you feel and how safely you function.

How it is diagnosed

Diagnosis requires a sleep study. Screening questionnaires such as STOP-Bang can estimate how likely sleep apnea is, but they cannot confirm or rule it out. The two main tests are:

• An in-lab polysomnogram (PSG) — an overnight recording in a sleep laboratory that measures brain activity, eye movement, muscle tone, breathing, oxygen, and heart rhythm.
• A home sleep apnea test (HSAT) — a simplified recording done in your own bed, used when obstructive sleep apnea is strongly suspected and there are no complicating conditions.

Results are reported as the number of breathing events per hour (the AHI). In adults, 5–14 is generally described as mild, 15–29 as moderate, and 30 or more as severe, always interpreted alongside symptoms.

Treatment options

Treatment is chosen with a clinician based on the type and severity of sleep apnea, your anatomy, other health conditions, and what you can realistically use every night.

Positive airway pressure (CPAP and related devices)

CPAP delivers gently pressurised air through a mask to keep the airway open. It is the most effective treatment for moderate-to-severe obstructive sleep apnea and is usually the first option offered. Modern devices are quieter and smaller than most people expect, and mask fit and early support make the biggest difference to whether it works for you.

Oral appliances

A custom mouthpiece made by a dentist trained in sleep medicine holds the lower jaw slightly forward to keep the airway open. It is an option for mild-to-moderate OSA, or for people who cannot tolerate CPAP.

Positional therapy and lifestyle changes

Some people have apnea mainly when lying on their back; devices or techniques that encourage side-sleeping can help. Weight management, avoiding alcohol in the evening, stopping smoking, and treating nasal congestion support every other treatment. See 10 lifestyle changes that can help manage sleep apnea.

Surgery and other options

For selected people, surgery on the nose, palate, tongue, or jaw, or an implanted nerve stimulator for the tongue, may be considered — usually after other options have been tried or ruled out. Central sleep apnea is managed differently, often by treating the underlying cause and, where appropriate, specialised ventilation devices.

When to talk with a doctor

If you snore loudly and are told you stop breathing, if you regularly wake gasping, or if daytime sleepiness affects your safety or your days, it is reasonable to raise sleep apnea with your doctor. You can bring notes on your symptoms, your STOP-Bang score, and any observations from a partner.

In summary

Sleep apnea is common, under-recognised, and treatable. The signs are often noticed first by someone else; the diagnosis needs a sleep study; and treatment, once it fits your life, usually improves sleep, energy, and long-term health. This article is education, not a diagnosis — the next step, if any of it sounds familiar, is a conversation with your own clinician.