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Stages of Sleep Apnea - Topic Overview

Sleep apnea occurs when you regularly stop breathing for 10 seconds or longer during sleep. It can be mild, moderate, or severe, based on the number of times an hour that you stop breathing (apnea) or that airflow to your lungs is reduced (hypopnea). This is called the apnea-hypopnea index (AHI).

  • Mild apnea. Mild apnea is defined as 5 to 14 episodes of apnea or reduced airflow to the lungs every hour. Symptoms may include drowsiness or falling asleep during activities that do not require much attention, such as watching television or reading. These symptoms may cause only minor problems at work or while spending time with friends or family.
  • Moderate apnea. Moderate apnea is defined as 15 to 29 episodes of apnea or reduced airflow to the lungs every hour. Symptoms may include drowsiness or falling asleep during activities that require some attention, such as attending a concert or a meeting. These symptoms may cause moderate problems with work or social functioning.
  • Severe apnea. Severe apnea is defined as 30 or more episodes of apnea or reduced airflow to the lungs every hour. Symptoms may include drowsiness or falling asleep during activities that require active attention, such as eating, talking, driving, or walking. These symptoms may cause severe problems with work or social functioning.

Sleep apnea may be classified differently in children, because they are still developing and they normally breathe at a faster rate than adults do.

Recommended Related to Sleep Disorders

When Your Partner Has a Sleep Disorder

When your partner has a sleep disorder, it's a good bet he or she is not the only one missing out on a good night's rest. More than likely, your sleep is being affected, too. In fact, having a partner with a sleep disorder can cause you to lose nearly one hour of sleep every night. That adds up to 12.5 full days of lost sleep each year. This loss of sleep can have a major impact on your health and well-being. In rare instances, such as with the flailing movements of REM (rapid eye movement) behavior...

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WebMD Medical Reference from Healthwise

Last Updated: June 25, 2013
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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