Stroke & Brain Health
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What Is Sleep Apnea?
In this short video, Amarish Dave, DO explains what sleep apnea is, the warning signs that show up at night and during the day, and why untreated sleep apnea matters for brain health.
Written and medically reviewed by Amarish Dave, DO, board-certified neurologist. This page is educational and does not replace an individual medical evaluation.
What Is Sleep Apnea?
Sleep apnea is a sleep-related breathing disorder in which breathing repeatedly slows or stops during sleep. In obstructive sleep apnea—the most common form—the muscles and tissues around the airway relax and block airflow, often producing loud snoring and then a pause, gasp or snort as breathing restarts. In central sleep apnea, the problem is different: the brain does not send steady signals to the muscles that control breathing. In both forms, each event briefly disrupts sleep and lowers oxygen levels, and this can happen many times an hour without the person fully waking.
What Are the Symptoms of Sleep Apnea?
The nighttime signs are often noticed first by a bed partner:
- Loud, frequent snoring
- Witnessed pauses in breathing, gasping or choking during sleep
- Restless sleep or frequent awakenings
- Waking with a dry mouth or morning headache
During the day, the effects of repeatedly broken sleep can include excessive sleepiness, fatigue, trouble concentrating, irritability and morning headaches. Because the symptoms develop gradually, many people assume poor sleep is normal for them—it often is not.
How Does Sleep Apnea Affect the Brain and Health?
Sleep is when the brain consolidates memory and restores attention, so repeatedly interrupted, oxygen-poor sleep takes a toll. Untreated sleep apnea is associated with high blood pressure and other cardiovascular problems, and it is considered a contributor to stroke risk. It can also worsen daytime thinking—overlapping with the effects of stress on the brain and with mood symptoms described in depression and the brain—and can compound the memory and concentration complaints that bring people for a memory and dementia evaluation. General brain-healthy habits, covered in Can Lifestyle Impact Dementia? and our sleep and brain health guide, work best when a breathing disorder like sleep apnea is identified and treated.
How Is Sleep Apnea Evaluated and Treated?
Evaluation usually starts with the pattern of symptoms and an examination, followed by a sleep study—either a home test or an overnight study in a sleep lab—to measure breathing, oxygen levels and sleep stages. Treatment depends on the cause and severity. Options can include CPAP or other breathing support during sleep, positional strategies, weight-related and other lifestyle changes, and, in selected cases, evaluation of the upper airway. The goal is simple: restore steady breathing and unbroken sleep so the brain and body can recover overnight.
When heavy daytime sleepiness needs prompt attention
Falling asleep while driving, near-miss accidents, or severe sleepiness that interferes with work and safety are not just inconvenient—they can be dangerous. If excessive daytime sleepiness is affecting your safety, seek medical evaluation promptly; do not drive when you are struggling to stay awake.
Key takeaways
- Sleep apnea means breathing repeatedly slows or stops during sleep—obstructive from a blocked airway, central from signaling problems in the brain.
- Loud snoring, witnessed pauses in breathing, gasping and unrefreshing sleep are common warning signs.
- Daytime sleepiness, poor concentration and morning headaches are frequent effects of broken sleep.
- Untreated sleep apnea is linked to high blood pressure and contributes to stroke risk.
- Diagnosis is made with a sleep study; treatment such as CPAP can restore sleep quality and daytime function.
Continue learning about sleep and brain health
Read our guide to sleep and brain health, learn about memory and dementia care, or browse more answers in the Neurology Video Library.
Frequently asked questions
- What is sleep apnea?
- Sleep apnea is a sleep-related breathing disorder in which breathing repeatedly slows or stops during sleep. In obstructive sleep apnea, the airway becomes blocked or narrowed; in central sleep apnea, the brain does not send consistent signals to the breathing muscles. Each pause briefly disrupts sleep and oxygen levels.
- What are the most common signs of sleep apnea?
- Loud or frequent snoring, witnessed pauses in breathing, gasping or choking during sleep, waking unrefreshed, excessive daytime sleepiness, morning headaches, and trouble with attention or memory. Bed partners often notice the breathing pauses before the person does.
- Can sleep apnea affect memory and concentration?
- Yes. Fragmented, poor-quality sleep and repeated drops in oxygen can interfere with attention, concentration and memory, and can contribute to daytime fatigue and mood symptoms. Treating sleep apnea can improve sleep quality and daytime function.
- Is sleep apnea connected to stroke and heart risk?
- Untreated sleep apnea is associated with high blood pressure and other cardiovascular problems, and it is considered a contributor to stroke risk. Managing sleep apnea is one part of protecting long-term brain and heart health.
- How is sleep apnea diagnosed and treated?
- Diagnosis is usually made with a sleep study, either at home or in a sleep lab, interpreted alongside symptoms and examination findings. Treatment depends on the cause and severity and may include CPAP or other breathing support, positional strategies, weight-related lifestyle changes, or evaluation of the upper airway.
- When should I mention sleep apnea to a doctor?
- If you snore loudly, someone has seen you stop breathing during sleep, you wake up gasping, or you feel sleepy during the day despite spending enough hours in bed, it is worth discussing with a healthcare professional. A neurologist can also help when poor sleep is affecting memory, headaches or other neurological symptoms.
Related videos
More medically reviewed neurology videos appear here automatically as they are published.
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