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Related Concept Videos

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...
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:
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...
Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
Overview of Synapses01:25

Overview of Synapses

A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the synapse and bind to...

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The Sleep Nullifying Apparatus: A Highly Efficient Method of Sleep Depriving Drosophila
06:06

The Sleep Nullifying Apparatus: A Highly Efficient Method of Sleep Depriving Drosophila

Published on: December 14, 2020

Basic biology of sleep.

John Harrington1, Teofilo Lee-Chiong

  • 1Division of Sleep Medicine, National Jewish Health, Denver, CO 80206, USA. harringtonj@njhealth.org

Dental Clinics of North America
|April 7, 2012
PubMed
Summary
This summary is machine-generated.

Sleep is a reversible state involving brain networks and neurotransmitters. Understanding sleep mechanisms is crucial as physiological changes during sleep can impact various medical conditions.

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Polygraphic Recording Procedure for Measuring Sleep in Mice
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Polygraphic Recording Procedure for Measuring Sleep in Mice

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

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Last Updated: May 23, 2026

The Sleep Nullifying Apparatus: A Highly Efficient Method of Sleep Depriving Drosophila
06:06

The Sleep Nullifying Apparatus: A Highly Efficient Method of Sleep Depriving Drosophila

Published on: December 14, 2020

Polygraphic Recording Procedure for Measuring Sleep in Mice
08:45

Polygraphic Recording Procedure for Measuring Sleep in Mice

Published on: January 25, 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 Medicine

Background:

  • Sleep is a complex, reversible state characterized by reduced responsiveness and specific postures.
  • It comprises two main stages: non-rapid eye movement (NREM) and rapid eye movement (REM) sleep.

Purpose of the Study:

  • To define sleep and its fundamental characteristics.
  • To highlight the neurobiological underpinnings of sleep regulation.
  • To underscore the clinical relevance of sleep physiology.

Main Methods:

  • Review of established sleep definitions and neurobiological principles.
  • Discussion of central nervous system networks involved in sleep generation.
  • Analysis of neurotransmitter systems and brain regions crucial for sleep.

Main Results:

  • Sleep is a dynamic state regulated by specific central nervous system networks.
  • Distinct neurotransmitters and brain areas are essential for NREM and REM sleep.
  • Physiological alterations during sleep can significantly affect disease presentation.

Conclusions:

  • Sleep is a fundamental biological process with complex neurochemical and anatomical bases.
  • Sleep's influence on physiological processes has direct implications for understanding and managing medical disorders.