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Related Concept Videos

Sleep-Wake Cycles01:24

Sleep-Wake Cycles

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:
Stages of Sleep01:22

Stages of Sleep

Sleep progresses through distinct stages, each characterized by specific brain wave patterns and physiological responses ranging from wakefulness to stages of non-rapid eye movement, known as non-REM, to rapid eye movement, referred to as REM. Understanding these stages helps in recognizing how sleep supports various bodily and cognitive functions.
Before sleep begins, in wakefulness, the brain exhibits primarily beta waves, which are high in frequency and low in amplitude, indicating alertness...
Management of Insomnia01:19

Management of Insomnia

The sleep cycle, an integral part of human health, consists of several stages with distinct characteristics and functions. It begins with a transition from wakefulness to sleep, known as the light sleep phase, followed by the restorative deep sleep phase, essential for physical recovery and growth. The cycle concludes with the Rapid Eye Movement (REM) phase, characterized by high brain activity and vivid dreaming. Insomnia, a prevalent sleep disorder, involves difficulty falling asleep, staying...
Narcolepsy01:07

Narcolepsy

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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Related Experiment Video

Updated: May 26, 2026

Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea
07:54

Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea

Published on: December 6, 2016

A new classification for sleep analysis in critically ill patients.

Xavier Drouot1, Ferran Roche-Campo, Arnaud W Thille

  • 1AP-HP, Groupe Henri Mondor-Albert Chenevier, Service de Physiologie, Créteil F-94010, France. xavier.drouot@hmn.aphp.fr

Sleep Medicine
|December 14, 2011
PubMed
Summary

Intensive care unit (ICU) patients often have altered sleep patterns. Abnormal electroencephalogram (EEG) findings in these patients may require new scoring criteria for atypical sleep and pathologic wakefulness.

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Last Updated: May 26, 2026

Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea
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Quantifying Infra-slow Dynamics of Spectral Power and Heart Rate in Sleeping Mice
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Published on: August 2, 2017

Multi-Modal Home Sleep Monitoring in Older Adults
07:40

Multi-Modal Home Sleep Monitoring in Older Adults

Published on: January 26, 2019

Area of Science:

  • Neurology
  • Intensive Care Medicine
  • Sleep Medicine

Background:

  • Intensive care unit (ICU) patients exhibit significant sleep disturbances.
  • Conventional sleep scoring methods are challenging in critically ill patients.
  • Previous research indicated abnormal sleep/wake electroencephalogram (EEG) patterns predict outcomes in acute respiratory failure patients on noninvasive ventilation.

Purpose of the Study:

  • To determine the prevalence of abnormal sleep/wake EEG patterns in a larger ICU patient cohort.
  • To identify objective parameters for recognizing these abnormal EEG patterns.

Main Methods:

  • Retrospective analysis of sleep studies using full polysomnography.
  • Inclusion of conscious, nonsedated ICU patients undergoing invasive or noninvasive ventilation for acute respiratory failure.
  • Studies were conducted over 17-hour periods.

Main Results:

  • Sleep scoring was not feasible in 16% (28%) of 57 included patients due to lack of stage-2 markers.
  • Abnormal features in wake EEG were observed in these patients, including reduced reactivity to eye opening and slower peak EEG frequency.
  • These findings differed from patients with normal sleep-wake EEGs.

Conclusions:

  • Standard sleep scoring criteria are insufficient for nearly one-third of awake, mechanically ventilated ICU patients.
  • Introduction of new classifications for 'atypical sleep' and 'pathologic wakefulness' is proposed.
  • Further research is needed to understand the origins and clinical significance of these abnormal EEG patterns.