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Related Concept Videos

Sleep Apnea01:21

Sleep Apnea

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Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
The condition is more prevalent among...
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Sleep-Wake Cycles01:24

Sleep-Wake Cycles

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Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
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Narcolepsy01:07

Narcolepsy

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Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.
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REM Sleep Behavior Disorder01:15

REM Sleep Behavior Disorder

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REM Sleep Behavior Disorder (RBD) is a sleep disorder characterized by the absence of muscle paralysis that normally occurs during the REM phase of sleep. This absence allows individuals to physically act out their dreams, which are often vivid and disturbing. Common behaviors exhibited during episodes include kicking, punching, and yelling. These actions can be dangerous, potentially leading to injuries for the person with RBD or their bed partner.
RBD is significantly associated with...
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Sleepwalking and Sleep Talking01:17

Sleepwalking and Sleep Talking

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Somnambulism, commonly known as sleepwalking, involves individuals engaging in activities ranging from simple walking to more complex behaviors such as driving. Sleepwalking typically occurs during the slow-wave sleep stages 3 and 4 early in the night when the person is not dreaming, contradicting the myth that sleepwalkers are acting out their dreams.
Factors that increase the likelihood of sleepwalking include sleep deprivation and alcohol consumption. Contrary to common beliefs, it is safe...
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Other Pulmonary Disorders01:17

Other Pulmonary Disorders

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Respiratory disorders encompass a range of conditions with varying levels of severity. Asthma, marked by chronic airway inflammation and hypersensitivity, is one such condition. It can lead to airway obstruction due to factors like bronchial spasms, mucosal edema, increased mucus secretion, or epithelial damage. Asthma triggers are diverse, ranging from allergens to emotional upset, and treatment focuses on both immediate relief through bronchodilators and long-term inflammation suppression.
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Related Experiment Video

Updated: May 1, 2026

Drug-Induced Sleep Endoscopy DISE with Target Controlled Infusion TCI and Bispectral Analysis in Obstructive Sleep Apnea
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Complex sleep apnea syndrome.

Muhammad Talha Khan1, Rose Amy Franco1

  • 1Division of Pulmonary, Critical Care and Sleep Medicine, Medical College of Wisconsin, 9200 W. Wisconsin Avenue, Milwaukee, WI 53226, USA.

Sleep Disorders
|April 3, 2014
PubMed
Summary
This summary is machine-generated.

Complex sleep apnea involves persistent central apneas despite positive airway pressure (PAP) therapy. Most cases resolve with PAP, but alternative treatments exist for persistent central sleep apnea.

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Area of Science:

  • Sleep Medicine
  • Respiratory Physiology

Background:

  • Complex sleep apnea is a sleep disordered breathing characterized by central apneas persisting after obstructive events are resolved with positive airway pressure (PAP).
  • Pathophysiology involves ventilator instability, increased carbon dioxide elimination from CPAP, and activation of pulmonary stretch receptors.

Purpose of the Study:

  • To define complex sleep apnea and discuss its pathophysiology, prevalence, and management.

Main Methods:

  • Review of existing literature on complex sleep apnea.
  • Analysis of contributing factors to central apneas during PAP therapy.

Main Results:

  • Prevalence of complex sleep apnea ranges from 0.56% to 18%, with no clear predictive characteristics.
  • The central apnea component often resolves with continued CPAP therapy.

Conclusions:

  • Complex sleep apnea requires specific management strategies beyond standard CPAP.
  • Treatment options for persistent central apneas include bilevel PAP, adaptive servoventilation, and pharmacotherapy.