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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.
RBD is significantly associated with...
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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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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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Restless Leg Syndrome and Night Terrors01:27

Restless Leg Syndrome and Night Terrors

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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.
The exact cause of RLS is not fully understood, but it is believed to involve dopamine, a neurotransmitter that helps regulate muscle movement. Imbalances in dopamine levels...
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Stages of Sleep01:22

Stages of Sleep

166
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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Functional Brain Systems: Reticular Formation01:13

Functional Brain Systems: Reticular Formation

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The reticular formation is a complex network of gray and white matter located within the brainstem extending from the medulla to the midbrain.
Within the reticular formation, there are several distinct nuclei that can be classified into three broad categories. The Raphe nuclei are located along the midline of the brainstem. They are primarily known for their role in synthesizing and releasing serotonin, a neurotransmitter involved in regulating mood, appetite, sleep, and circadian rhythms. The...
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Related Experiment Video

Updated: May 27, 2025

Electroencephalography Network Indices as Biomarkers of Upper Limb Impairment in Chronic Stroke
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Published on: July 14, 2023

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Lesion network mapping of REM Sleep Behaviour Disorder.

H Odd1, C Dore1, S H Eriksson2

  • 1Functional Imaging Laboratory, Department of Imaging Neuroscience, UCL Queen Square Institute of Neurology, University College London, UK.

Neuroimage. Clinical
|February 15, 2025
PubMed
Summary
This summary is machine-generated.

REM Sleep Behaviour Disorder (RBD) is linked to brainstem damage disrupting sleep atonia. This study identifies a brainstem disconnection syndrome, suggesting damage along specific white matter tracts causes RBD, explaining disease variability.

Keywords:
Alpha-synuclein DisordersLesion Network MappingLewy Body DisordersMeta-analysisProbabilistic TractographyREM Sleep Behaviour Disorder

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Area of Science:

  • Neuroscience
  • Sleep Medicine
  • Neurology

Background:

  • REM Sleep Behaviour Disorder (RBD) involves loss of muscle paralysis during REM sleep, leading to dream enactment.
  • Idiopathic RBD is a significant risk factor for future alpha-synucleinopathies, such as Parkinson's disease.
  • The precise neuroanatomical underpinnings of RBD in humans are not fully understood, despite animal studies identifying brainstem structures involved in sleep atonia.

Purpose of the Study:

  • To empirically define a candidate anatomical network for RBD using lesion network mapping.
  • To test the hypothesis that RBD results from damage to specific brainstem nodes, their white matter connections, or other brain regions.
  • To identify the critical brainstem regions and tracts involved in maintaining REM sleep atonia.

Main Methods:

  • Reviewed published cases of secondary RBD with discrete brain lesions to create lesion masks (n=25).
  • Utilized MRI lesion masks from pontine strokes without RBD (n=15) as an exclusion mask.
  • Employed lesion network mapping, probabilistic tractography, and warping to the Human Connectome dataset to identify and characterize the RBD network.

Main Results:

  • Lesions associated with RBD were predominantly located in the brainstem, with significant variability.
  • 72% of RBD lesions directly intersected with white matter tracts derived from pontine regions of interest (ROIs) overlapping the locus coeruleus.
  • 92% of lesions were at or caudal to the maximal overlap region, suggesting a critical tract connecting the rostral locus coeruleus and medulla.

Conclusions:

  • RBD appears to be a brainstem disconnection syndrome, where damage to the tract connecting the rostral locus coeruleus and medulla impairs sleep atonia.
  • This model aligns with animal literature and may explain the variability in neuroimaging findings and clinical presentation of idiopathic RBD.
  • Understanding this network provides insights into the pathophysiology of RBD and its association with alpha-synuclein disorders.