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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,...
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Circadian Rhythms and Gene Regulation

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Understanding Sleep01:11

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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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Sleep-Wake Cycles01:24

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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).
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Related Experiment Video

Updated: May 20, 2026

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

[Sleep regulatory mechanisms].

Hiroyoshi Sei1, Noriyuki Shimizu, Kazuyoshi Kitaoka

  • 1Department of Integrative Physiology, Institute of Health Biosciences, The University of Tokushima Graduate School.

Nihon Rinsho. Japanese Journal of Clinical Medicine
|August 1, 2012
PubMed
Summary

Sleep is essential for brain maintenance and repair, not just rest. Research suggests factors like oxidative stress and inflammation trigger sleep, regulated by the brain's internal clock.

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Last Updated: May 20, 2026

Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice
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Published on: June 19, 2019

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Area of Science:

  • Neuroscience
  • Sleep Science

Context:

  • Resting wakefulness does not fulfill the brain's need for sleep.
  • Sleep plays a critical role in brain maintenance and repair.

Purpose:

  • To explore the underlying mechanisms and regulation of sleep.
  • To investigate the triggers and timing of sleep induction.

Summary:

  • Neuronal oxidative stress, neuroinflammation, and energy insufficiency are potential triggers for sleep.
  • The brain's internal circadian clock regulates the timing of sleep.
  • Sleep is a brain-initiated and brain-regulated process.

Impact:

  • Understanding how we sleep is crucial for addressing sleep disorders.
  • This research contributes to the fundamental knowledge of brain function and health.