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Related Concept Videos

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.
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:
REM Sleep Behavior Disorder01:15

REM Sleep Behavior Disorder

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...
Insufficient Sleep and Sleep Deprivation01:13

Insufficient Sleep and Sleep Deprivation

Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
Sleep deprivation is a more severe form of sleep loss...
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...
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...

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Related Experiment Video

Updated: Jun 8, 2026

Chronic Sleep Deprivation in Mouse Pups by Means of Gentle Handling
03:46

Chronic Sleep Deprivation in Mouse Pups by Means of Gentle Handling

Published on: October 11, 2018

Selective REM sleep deprivation in narcolepsy.

Manh Hoang Vu1, Christoph Hurni, Johannes Mathis

  • 1Neurology Department, University Hospital of Bern, Bern, Switzerland.

Journal of Sleep Research
|October 1, 2010
PubMed
Summary

Narcolepsy patients exhibit higher REM sleep pressure than controls, indicating altered sleep homeostasis. REM sleep deprivation impacts sleep propensity but not cataplexy in narcolepsy.

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Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
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Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood

Published on: October 2, 2019

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Last Updated: Jun 8, 2026

Chronic Sleep Deprivation in Mouse Pups by Means of Gentle Handling
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Chronic Sleep Deprivation in Mouse Pups by Means of Gentle Handling

Published on: October 11, 2018

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
08:20

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood

Published on: October 2, 2019

Area of Science:

  • Neuroscience
  • Sleep Medicine

Background:

  • Narcolepsy is a sleep disorder characterized by excessive daytime sleepiness and REM sleep abnormalities.
  • Cataplexy is a key symptom associated with narcolepsy.

Purpose of the Study:

  • To investigate REM sleep pressure and homeostasis in individuals with narcolepsy.
  • To compare REM sleep regulation between narcolepsy patients and healthy controls.

Main Methods:

  • A REM sleep deprivation protocol was applied to six narcolepsy patients and six controls.
  • Polysomnography and Multiple Sleep Latency Tests (MSLTs) were used to monitor sleep patterns.
  • REM sleep was prevented by targeted awakenings during deprivation nights.

Main Results:

  • Narcoleptics required more interventions to prevent REM sleep, suggesting higher REM sleep pressure.
  • Both groups showed reduced total sleep time during deprivation, but no REM sleep rebound occurred.
  • Narcoleptics experienced an increase in sleep-onset REM periods (SOREMs) post-deprivation, but cataplexy did not increase.

Conclusions:

  • REM sleep pressure is elevated in narcolepsy patients.
  • REM sleep homeostasis appears similar between narcoleptics and controls.
  • REM sleep deprivation affects sleep propensity but not cataplexy in narcolepsy.