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Related Concept Videos

Stages of Sleep01:22

Stages of Sleep

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...
Sleep-Wake Cycles01:24

Sleep-Wake Cycles

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:
REM Sleep Behavior Disorder01:15

REM Sleep Behavior Disorder

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...
Functional Brain Systems: Reticular Formation01:13

Functional Brain Systems: Reticular Formation

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...
Understanding Sleep01:11

Understanding Sleep

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.
The circadian rhythm, a nearly 24-hour cycle, is deeply influenced by environmental light cues. Light exposure directly affects the hypothalamus, which in turn regulates...
Brainstem01:19

Brainstem

The brainstem, located inferior to the brain and superior to the spinal cord, serves as a bridge between the cerebrum and the spinal cord. It plays a vital role in relaying information and controlling critical life functions. It comprises three primary regions: the midbrain, pons, and medulla oblongata.
The Midbrain
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Related Experiment Video

Updated: May 27, 2026

Quantifying Infra-slow Dynamics of Spectral Power and Heart Rate in Sleeping Mice
10:56

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

Published on: August 2, 2017

Low-dimensional population dynamics in the brainstem gate REM sleep.

David E Lozano1, Jiso Hong1, Xi Jin1

  • 1Department of Neuroscience, Chronobiology and Sleep Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.

Nature Neuroscience
|May 25, 2026
PubMed
Summary
This summary is machine-generated.

Researchers discovered a brainstem mechanism controlling transitions to rapid-eye-movement (REM) sleep. Neural population dynamics, particularly infraslow fluctuations, gate the initiation of REM sleep episodes.

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Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice

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Related Experiment Videos

Last Updated: May 27, 2026

Quantifying Infra-slow Dynamics of Spectral Power and Heart Rate in Sleeping Mice
10:56

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

Published on: August 2, 2017

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons
09:04

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons

Published on: September 14, 2016

Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice
08:58

Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice

Published on: June 19, 2019

Area of Science:

  • Neuroscience
  • Sleep Science
  • Computational Neuroscience

Background:

  • Rapid-eye-movement (REM) sleep generation occurs in the brainstem.
  • The precise neural population dynamics governing NREM-to-REM sleep transitions are not well understood.

Purpose of the Study:

  • To investigate the brainstem population dynamics underlying REM sleep initiation.
  • To identify neural mechanisms that gate the transition from non-REM (NREM) to REM sleep.

Main Methods:

  • Utilized mouse Neuropixels recordings for high-density neural activity capture.
  • Applied dimensionality reduction techniques to analyze population dynamics.
  • Examined neural activity during NREM-to-REM sleep transitions.

Main Results:

  • Brainstem population activity is characterized by two main components, including infraslow fluctuations.
  • NREM-to-REM transitions follow a specific trajectory, preceded by increased infraslow activity.
  • Identified REM-active and REM-inhibited neuronal subpopulations with opposing infraslow dynamics and antagonistic functional connections.
  • Activation of REM-promoting neurons enhances infraslow component, gating REM sleep induction.

Conclusions:

  • A population-level mechanism involving low-dimensional, antagonistic brainstem dynamics coordinates NREM-to-REM sleep transitions.
  • Infraslow neural fluctuations play a critical role in gating REM sleep.
  • This study reveals a novel insight into the neural control of sleep state transitions.