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Related Concept Videos

Sleep-Wake Cycles01:24

Sleep-Wake Cycles

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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).
NREM Sleep
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Circadian Rhythms and Gene Regulation02:19

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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...
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REM Sleep Behavior Disorder01:15

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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...
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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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Insomnia01:27

Insomnia

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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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Narcolepsy01:07

Narcolepsy

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Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.
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Updated: Dec 12, 2025

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

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Circadian Rhythm Sleep-Wake Disorders.

Phyllis C Zee, Sabra M Abbott

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    Summary
    This summary is machine-generated.

    This review covers circadian physiology and sleep disorders. Circadian rhythm disruption is linked to health issues, including cardiometabolic disease risk.

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    Area of Science:

    • Neuroscience
    • Sleep Medicine
    • Endocrinology

    Background:

    • Circadian rhythms are fundamental biological processes influencing physiology across the body.
    • Growing evidence links circadian dysregulation to adverse health outcomes, notably cardiometabolic disease risk.
    • Understanding circadian neurophysiology is crucial for comprehending neuropathology-associated circadian dysfunction.

    Purpose of the Study:

    • To provide an overview of circadian physiology.
    • To discuss common presentations of circadian rhythm sleep-wake disorders.
    • To outline treatment strategies for these disorders.

    Main Methods:

    • Literature review of circadian physiology.
    • Analysis of clinical presentations of circadian rhythm sleep-wake disorders.
    • Synthesis of current treatment approaches.

    Main Results:

    • Circadian rhythms are ubiquitous in the brain and body.
    • Circadian disruption is increasingly associated with cardiometabolic disease.
    • Neuropathologies affecting the visual pathway or hypothalamus can lead to circadian dysfunction.

    Conclusions:

    • Recognizing the widespread role of circadian rhythms is essential.
    • Understanding circadian neurophysiology offers insights into dysfunction mechanisms.
    • Effective management of circadian rhythm sleep-wake disorders requires awareness of their presentations and treatments.