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Related Concept Videos

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,...
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:
Management of Insomnia01:19

Management of Insomnia

The sleep cycle, an integral part of human health, consists of several stages with distinct characteristics and functions. It begins with a transition from wakefulness to sleep, known as the light sleep phase, followed by the restorative deep sleep phase, essential for physical recovery and growth. The cycle concludes with the Rapid Eye Movement (REM) phase, characterized by high brain activity and vivid dreaming. Insomnia, a prevalent sleep disorder, involves difficulty falling asleep, staying...
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...
Insomnia01:27

Insomnia

Insomnia is a prevalent sleep disorder characterized by difficulty falling asleep, frequent awakenings during the night, and waking up too early without being able to return to sleep. People with insomnia often experience these disruptions at least three nights a week for at least one month. Chronic insomnia, which lasts for at least three months, can lead to increased anxiety, which in turn can worsen sleep difficulties, creating a cycle of sleeplessness and stress.
Multiple factors contribute...

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Updated: May 17, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
08:36

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

Circadian rhythm sleep disorders.

Lirong Zhu1, Phyllis C Zee

  • 1Department of Neurology, Circadian Rhythms and Sleep Research Lab, Northwestern University, 710 North Lake Shore Drive, 5th Floor, Chicago, IL 60611, USA.

Neurologic Clinics
|October 27, 2012
PubMed
Summary
This summary is machine-generated.

Circadian rhythm sleep disorders (CRSDs) arise from disruptions in the body's internal clock or its alignment with the environment. Understanding these mechanisms improves health, performance, and safety.

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Last Updated: May 17, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
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Published on: August 8, 2019

Through-the-Wall Blood Sampling Method to Minimize Sleep Disruption in Clinical Settings
06:39

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Recording and Analysis of Circadian Rhythms in Running-wheel Activity in Rodents
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Published on: January 24, 2013

Area of Science:

  • Chronobiology
  • Sleep Medicine
  • Neuroscience

Background:

  • Recent advances illuminate the molecular, cellular, and physiological regulation of circadian rhythms.
  • Circadian dysfunction significantly impacts overall health, disease progression, performance, and safety.
  • Circadian rhythm sleep disorders (CRSDs) stem from disruptions in the central circadian timekeeping system or environmental misalignment.

Purpose of the Study:

  • To review fundamental circadian biology.
  • To discuss the pathophysiology, clinical features, diagnosis, and treatment of common CRSDs.

Main Methods:

  • Literature review of circadian biology.
  • Synthesis of current knowledge on CRSD pathophysiology.
  • Overview of clinical diagnostic criteria and therapeutic strategies.

Main Results:

  • Detailed explanation of the molecular and physiological basis of circadian rhythms.
  • Elucidation of how CRSDs affect health, performance, and safety.
  • Comprehensive summary of common CRSDs encountered in clinical practice.

Conclusions:

  • A thorough understanding of circadian biology is crucial for managing CRSDs.
  • Effective diagnosis and treatment of CRSDs depend on recognizing their underlying pathophysiology and clinical presentations.
  • This review provides a foundation for clinicians managing patients with circadian rhythm sleep disorders.