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Related Concept Videos

REM Sleep Behavior Disorder01:15

REM Sleep Behavior Disorder

143
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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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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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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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.
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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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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Sleepwalking and Sleep Talking01:17

Sleepwalking and Sleep Talking

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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.
Factors that increase the likelihood of sleepwalking include sleep deprivation and alcohol consumption. Contrary to common beliefs, it is safe...
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Related Experiment Video

Updated: Jun 4, 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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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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Longitudinal network changes and phenoconversion risk in isolated REM sleep behavior disorder.

Chris C Tang1, Yoshikazu Nakano1, An Vo1,2

  • 1Center for Neurosciences, The Feinstein Institutes for Medical Research, Manhasset, NY, USA.

Nature Communications
|December 31, 2024
PubMed
Summary
This summary is machine-generated.

Individuals with REM sleep behavior disorder show progressive network changes years before Parkinson's disease symptoms. Network progression rate can predict disease onset, aiding in clinical trials.

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Related Experiment Videos

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Area of Science:

  • Neuroscience
  • Neurology
  • Medical Imaging

Background:

  • Isolated REM sleep behavior disorder (RBD) is an early sign of α-synucleinopathies.
  • Understanding the progression of neurological changes in RBD is crucial for early intervention.

Purpose of the Study:

  • To longitudinally assess metabolic network changes and dopaminergic input in individuals with RBD.
  • To correlate baseline network expression with time to phenoconversion to Parkinson's disease or dementia with Lewy bodies.

Main Methods:

  • Positron emission tomography (PET) imaging was used in a 4-year longitudinal study of 13 male subjects with RBD.
  • Analysis focused on Parkinson's disease-related motor and cognitive metabolic networks and caudate/putamen dopaminergic input.
  • An independent validation sample was used to correlate baseline network expression with phenoconversion times.

Main Results:

  • Over 4 years, Parkinson's disease-related network expression increased, while dopaminergic input declined.
  • Abnormal functional connections within and between networks emerged over time, compromising information flow.
  • Baseline network expression inversely correlated with time to phenoconversion in the validation sample.

Conclusions:

  • Network progression in RBD patients indicates compromised brain function years before clinical diagnosis.
  • The rate of network progression is a potential outcome measure for disease modification trials in α-synucleinopathies.