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Related Concept Videos

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.
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Sleep-Wake Cycles01:24

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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
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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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Sleepwalking and Sleep Talking01:17

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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.
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Restless Leg Syndrome and Night Terrors01:27

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Restless Leg Syndrome (RLS), also known as Willis-Ekbom disease, is a neurological disorder characterized by an uncontrollable urge to move the legs due to uncomfortable sensations. These sensations typically occur during periods of rest or inactivity, particularly when lying down or sitting, and can severely disrupt sleep.
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Stages of Sleep01:22

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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.
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Related Experiment Video

Updated: May 3, 2026

A Chronic Sleep Fragmentation Model using Vibrating Orbital Rotor to Induce Cognitive Deficit and Anxiety-Like Behavior in Young Wild-Type Mice
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Abnormal metabolic network activity in REM sleep behavior disorder.

Florian Holtbernd1, Jean-François Gagnon, Ron B Postuma

  • 1From the Center for Neurosciences (F.H., Y.M., C.C.T., A.F., V.D., D.E.), The Feinstein Institute for Medical Research, Manhasset, NY; Center for Advanced Research in Sleep Medicine (J.-F.G., R.B.P., M.V., J.M.), Hôpital du Sacré-Coeur de Montréal; Department of Psychology (J.-F.G., M.V.), Université du Québec à Montréal; Department of Neurology (R.B.P.), Montreal General Hospital; Montreal Neurological Institute (J.-P.S.), McGill University; and Department of Psychiatry (J.M.), University of Montreal, Montréal, Canada.

Neurology
|January 24, 2014
PubMed
Summary
This summary is machine-generated.

Parkinson disease-related covariance pattern (PDRP) expression is elevated in REM sleep behavior disorder (RBD) patients. Increased PDRP activity predicts phenoconversion to neurodegenerative syndromes like Parkinson disease.

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Area of Science:

  • Neurology
  • Neuroimaging
  • Sleep Medicine

Background:

  • Idiopathic REM sleep behavior disorder (RBD) is linked to increased risk of synucleinopathies.
  • The Parkinson disease-related covariance pattern (PDRP) is a known neuroimaging biomarker.

Purpose of the Study:

  • To investigate if PDRP expression is elevated in idiopathic RBD.
  • To determine if heightened PDRP activity predicts phenoconversion to Parkinson disease or related disorders.

Main Methods:

  • Two cohorts of RBD patients and controls underwent resting-state (18)F-fluorodeoxyglucose PET or ethylcysteinate dimer SPECT.
  • PDRP expression was quantified and compared between groups.
  • One cohort was followed for clinical phenoconversion.

Main Results:

  • PDRP expression was significantly elevated in both RBD cohorts compared to controls.
  • Phenoconversion to Parkinson disease or dementia with Lewy bodies occurred in 8 of 17 followed RBD subjects.
  • PDRP expression and age accurately predicted phenoconversion status (r(2) = 0.64, p < 0.0001).

Conclusions:

  • Elevated PDRP expression in idiopathic RBD indicates latent network abnormalities.
  • These abnormalities are associated with an increased risk of developing progressive neurodegenerative syndromes.