Sleep Apnea

What Is Sleep Apnea?

Sleep apnea is a chronic condition in which breathing repeatedly stops and starts throughout the night. These pauses in breathing can last several seconds or longer and may occur dozens of times while you sleep. According to the National Heart, Lung, and Blood Institute (NHLBI), this pattern prevents the body from getting adequate oxygen and disrupts deep, restorative sleep.

Many individuals do not realize these interruptions occur during sleep because the effects appear throughout the day. Poor-quality rest can affect your mood and lead to difficulty concentrating, daytime fatigue, and reduced overall well-being.

Sleep apnea can present in different forms, and understanding each type helps guide accurate diagnosis and treatment.

Types of Sleep Apnea

The NHLBI identifies three main types of sleep apnea. These include:

• Obstructive Sleep Apnea
• Central Sleep Apnea
• Complex (Mixed) Sleep Apnea

Each form has distinct causes and patterns, although symptoms often overlap.

Obstructive Sleep Apnea

Obstructive sleep apnea (OSA) is the most common type of sleep apnea. It occurs when the upper airway repeatedly becomes blocked during sleep, usually because the soft tissues at the back of the throat relax too much.

During an OSA episode, a person continues breathing, but airflow is restricted or completely blocked. This can lead to drops in oxygen levels and frequent brief awakenings, even if they do not fully regain consciousness.

Because the airway collapses repeatedly, the body must work harder to maintain normal breathing, especially during deeper stages of sleep.

Central Sleep Apnea

Central sleep apnea (CSA) occurs when the brain fails to send consistent signals to the muscles that control breathing. Unlike OSA, the airway itself is not blocked; instead, the issue lies in how the brain regulates breathing rhythm.

CSA often occurs alongside medical conditions that affect the brainstem or heart function. Because the breathing pattern is irregular rather than obstructive, CSA requires a different evaluation and treatment than OSA.

Complex Sleep Apnea

Complex sleep apnea occurs when an individual has both obstructive and central characteristics. It may first appear during treatment for OSA if central breathing problems begin to emerge.

Managing complex sleep apnea often requires careful monitoring to determine the extent to which each component contributes to the overall breathing disruption.

What Are The Symptoms Of Sleep Apnea?

Many individuals experience symptoms both at night and throughout the day. The NHLBI lists several common signs of sleep apnea.

Nighttime symptoms may include:

• Loud or frequent snoring
• Breathing that starts and stops repeatedly
• Gasping or choking during sleep
• Waking up with a dry mouth

Daytime symptoms may include:

• Excessive daytime fatigue
• Difficulty concentrating or memory issues
• Irritability or mood changes
• Morning headaches
• Fragmented or poor-quality sleep

Because sleep apnea episodes happen during sleep, many individuals go undiagnosed until symptoms begin to affect daily functioning.

What Causes Sleep Apnea?

Sleep apnea causes differ depending on the type. In OSA, the most common cause is airway obstruction or narrowing. According to the NHLBI, OSA can develop when throat muscles relax too much or when structural features — such as the tongue, tonsils, or jaw — limit airflow.

Other contributing factors may include:

• Hormonal changes that affect muscle tone or airway tissues
• Extra tissue around the airway
• Conditions that reduce airway size

CSA, by contrast, is caused by disruptions in the brain’s breathing control signals, rather than physical obstruction.

These different mechanisms explain why symptoms and treatment needs vary from one person to another.

Risk Factors

Risk factors for sleep apnea include physical features, lifestyle factors, and chronic health conditions. Risk factors include:

• Higher body weight
• Older age
• Family history of sleep apnea
• Anatomical airway features
• Nasal congestion
• Smoking
• Alcohol use

The Centers for Disease Control and Prevention (CDC) highlights the connection between sleep disorders and heart health, noting that insufficient or poor-quality sleep can increase the risk of heart disease, stroke, and high blood pressure.

Can Alcohol Use Worsen Sleep Apnea?

Alcohol can worsen sleep apnea because it relaxes the muscles of the throat, increasing the likelihood of airway collapse during sleep. When relaxation is increased, obstructive events become more frequent or severe, leading to lower oxygen levels and more sleep disruption.

Alcohol may also lengthen the duration of apnea episodes, adding strain to the cardiovascular system.

Diagnosis

Diagnosis typically begins with a healthcare evaluation and review of symptoms. If a provider suspects sleep apnea, they may recommend a sleep study.

Diagnostic approaches include:

• Overnight polysomnography (PSG): A detailed sleep study conducted in a clinical sleep lab. This test monitors breathing, oxygen levels, heart rate, brain activity, and body movements.
• Home sleep apnea testing: A portable test used in the home environment that measures airflow, breathing effort, and oxygen saturation.

Both methods help determine the type and severity of sleep apnea, guiding the next steps in treatment.

Does Untreated Sleep Apnea Affect Life Expectancy?

Untreated sleep apnea can have long-term consequences, especially for cardiovascular health. Repeated breathing interruptions cause frequent drops in oxygen levels and activate the body’s stress response.

The CDC notes that insufficient or fragmented sleep is linked with high blood pressure and heart disease, which may increase the risk of stroke and other chronic conditions.

For individuals with conditions like sickle cell disease (SCD), untreated sleep-disordered breathing may also worsen overall health and increase complications.

Because sleep apnea disrupts deep sleep and affects oxygen levels, managing it is essential for long-term health and well-being.

Treatment

Sleep apnea treatment focuses on improving airflow during sleep, stabilizing breathing patterns, and restoring restful sleep. According to NHLBI, standard treatment options include:

• Positive Airway Pressure (PAP) therapy: Devices such as CPAP or BiPAP keep the airway open by delivering gentle, pressurized air.
• Oral appliances: Custom dental devices may reposition the jaw or tongue to help maintain an open airway.
• Lifestyle changes: Adjustments such as weight management, reduced alcohol use, or sleeping in a new position can reduce symptoms.
• Surgery: In some instances, procedures that remove or reposition tissue may help open the airway.

Treatment is tailored to the individual depending on their sleep apnea type and severity.

Is There A Cure For Sleep Apnea?

There is no universal cure for sleep apnea, but many individuals achieve significant symptom improvement with ongoing treatment. For some, addressing the underlying anatomical causes, such as removing enlarged tissue, may lead to lasting improvement.

For most individuals, long-term management with PAP therapy, lifestyle adjustments, or other treatments helps maintain airway stability and restore healthy sleep.

Consistent treatment can lead to meaningful improvements in mood, concentration, daytime energy, and cardiovascular health.

Sleep-Disordered Breathing in Health Conditions

Some chronic health conditions can increase the likelihood of sleep-disordered breathing. The CDC reports that individuals with SCD may experience more frequent sleep-related breathing problems, including obstructive events, compared with the general population.

Sleep-disordered breathing in SCD can contribute to pain episodes, daytime fatigue, and reduced quality of life. Because of these added risks, awareness and early evaluation in individuals with chronic medical conditions are especially important.

Sleep Apnea and Long-Term Health

Recognizing sleep apnea symptoms and seeking evaluation can lead to life-changing improvements in sleep, cardiovascular health, and daily functioning. Understanding the different types of sleep apnea — obstructive, central, and complex — helps guide appropriate care and empowers you to make informed treatment choices.

With proper diagnosis and treatment, many people regain restful sleep, experience greater daytime energy, and reduce their risk of long-term complications. Prioritizing sleep health is an important step toward supporting overall well-being.