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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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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

Stages of Sleep

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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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Narcolepsy01:07

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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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Updated: Oct 9, 2025

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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Glymphatic dysfunction in isolated REM sleep behavior disorder.

Dong Ah Lee1, Ho-Joon Lee2, Kang Min Park1

  • 1Department of Neurology, Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea.

Acta Neurologica Scandinavica
|December 17, 2021
PubMed
Summary
This summary is machine-generated.

Patients with isolated rapid eye movement sleep behavior disorder (iRBD) exhibit impaired glymphatic system function, as shown by a lower diffusion tensor imaging along the perivascular space (DTI-ALPS) index. This finding suggests DTI-ALPS may be a biomarker for neurological disorders.

Keywords:
REM sleepdiffusion tensor imagingglymphatic system

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Area of Science:

  • Neuroscience
  • Radiology
  • Sleep Medicine

Background:

  • Glymphatic system dysfunction is implicated in various neurological disorders.
  • Rapid eye movement sleep behavior disorder (iRBD) is a neurodegenerative disease precursor.

Purpose of the Study:

  • To evaluate glymphatic system function in patients with iRBD using diffusion tensor imaging along the perivascular space (DTI-ALPS).
  • To compare DTI-ALPS in iRBD patients versus healthy controls.
  • To investigate potential correlations between DTI-ALPS and clinical characteristics.

Main Methods:

  • Retrospective analysis of 18 iRBD patients and 18 age/sex-matched healthy controls.
  • Acquisition of diffusion tensor imaging (DTI) magnetic resonance imaging (MRI) data using a 3T scanner.
  • Calculation of the DTI-ALPS index to assess glymphatic function.

Main Results:

  • The DTI-ALPS index was significantly lower in iRBD patients (1.5647) compared to healthy controls (1.7612) (p=0.0157).
  • No significant correlation was found between the DTI-ALPS index and demographic or polysomnographic parameters.

Conclusions:

  • Patients with iRBD demonstrate impaired glymphatic system function.
  • The DTI-ALPS index shows potential as a biomarker for assessing glymphatic system function in neurological conditions.