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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,...
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Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response

Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
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Biological Clocks and Seasonal Responses02:45

Biological Clocks and Seasonal Responses

The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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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...

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Related Experiment Video

Updated: Jun 20, 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 disorders.

Kathryn J Reid1, Phyllis C Zee

  • 1Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA. k-reid@northwestern.edu

Seminars in Neurology
|September 11, 2009
PubMed
Summary
This summary is machine-generated.

Circadian rhythm sleep disorders disrupt sleep due to internal clock and external environment misalignment. Future research will improve diagnosis and treatments for better quality of life.

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Area of Science:

  • Sleep Medicine
  • Chronobiology

Background:

  • Circadian rhythm sleep disorders arise from a mismatch between the body's internal clock and external cues.
  • These conditions manifest as insomnia and excessive daytime sleepiness, impacting daily functioning and quality of life.

Purpose of the Study:

  • To review the current understanding of circadian rhythm sleep disorders.
  • To discuss the limitations in current diagnostic tools and clinical trials.
  • To highlight the potential for future treatments based on advancing research.

Main Methods:

  • Literature review of circadian rhythm sleep disorders.
  • Analysis of current treatment modalities and their limitations.
  • Exploration of recent advances in circadian biology.

Main Results:

  • Circadian rhythm sleep disorders result from internal or external timing system alterations.
  • Physiologic, behavioral, and environmental factors influence clinical presentation.
  • Current treatments like light therapy and melatonin aim to resynchronize circadian rhythms.

Conclusions:

  • Despite effective treatments, clinical application is hindered by diagnostic and trial limitations.
  • Advances in understanding circadian regulation offer promise for more targeted therapies.
  • Further research is crucial for developing improved diagnostic tools and treatments.