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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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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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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
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Understanding Sleep01:11

Understanding Sleep

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Sleep, an essential biological state, involves significant reductions in physical activity, sensory awareness, and interaction with the environment. This complex physiological process is primarily regulated by specific brain regions, notably the hypothalamus and pons, which govern the sleep-wake cycle or circadian rhythm.
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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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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: Jan 12, 2026

Quantifying Infra-slow Dynamics of Spectral Power and Heart Rate in Sleeping Mice
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Quantifying Infra-slow Dynamics of Spectral Power and Heart Rate in Sleeping Mice

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Cracking the complexity of REM sleep.

Yufan Dong1, Danqian Liu2

  • 1Institute of Neuroscience, Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai 200031, China; University of Chinese Academy of Sciences, Beijing 100049, China.

Trends in Neurosciences
|November 7, 2025
PubMed
Summary

Rapid eye movement (REM) sleep involves brain activation and muscle paralysis. A hierarchical framework explains REM sleep generation and regulation by brainstem, hypothalamic, cortical, and neuromodulatory systems.

Keywords:
brain rhythmsemotionevolutionmemorymotor activityneural circuits

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Area of Science:

  • Neuroscience
  • Sleep Science
  • Computational Neuroscience

Background:

  • Rapid eye movement (REM) sleep is a complex brain state characterized by high neural activity and muscle atonia.
  • Recent research highlights REM sleep's dynamic nature, involving coordinated oscillations and phasic events with developmental and species-specific variations.
  • Understanding the neural circuits governing REM sleep generation and its components is crucial.

Purpose of the Study:

  • To propose a hierarchical circuit framework for understanding REM sleep generation and regulation.
  • To synthesize recent findings on the role of theta oscillations and forebrain circuits in REM sleep functions.
  • To identify future research directions for a comprehensive understanding of REM sleep.

Main Methods:

  • Literature review and synthesis of recent advances in neural circuit studies of REM sleep.
  • Component- and circuit-based analysis of REM sleep regulation.
  • Integration of findings on brain oscillations and forebrain circuit involvement.

Main Results:

  • A hierarchical circuit framework is proposed, with brainstem nuclei generating core REM sleep features.
  • Hypothalamic, cortical, and neuromodulatory systems adaptively tune REM sleep.
  • Theta oscillations and distributed forebrain circuits are implicated in REM sleep functions related to memory, emotion, and cognition.

Conclusions:

  • The proposed hierarchical framework provides a structured approach to understanding REM sleep.
  • Theta oscillations and forebrain circuits play significant roles in mediating REM sleep's functional aspects.
  • Further research is needed to refine and integrate circuit-based models of REM sleep.