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Related Concept Videos

Narcolepsy01:07

Narcolepsy

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.
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:
Brain Imaging01:14

Brain Imaging

Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans),  magnetic resonance imaging (MRI),  functional magnetic resonance imaging (fMRI), and Transcranial Magnetic Stimulation (TMS).

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Related Experiment Video

Updated: Jun 20, 2026

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
08:20

Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood

Published on: October 2, 2019

Neuroimaging of narcolepsy.

Thien Thanh Dang-Vu1, Martin Desseilles, Sophie Schwartz

  • 1Cyclotron Research Centre, University of Liege, Liege, Belgium. tt.dangvu@ulg.ac.be

CNS & Neurological Disorders Drug Targets
|August 20, 2009
PubMed
Summary

Neuroimaging studies reveal the hypothalamus

Area of Science:

  • Neuroimaging
  • Sleep Medicine
  • Neurology

Background:

  • Neuroimaging has advanced understanding of the sleep-wake cycle in healthy individuals.
  • Brain imaging studies in patients with sleep disorders, particularly narcolepsy, are limited.
  • The hypothalamus and hypocretin-orexin system are implicated in narcolepsy pathophysiology.

Purpose of the Study:

  • To review neuroimaging findings in narcolepsy, focusing on the hypothalamus and cataplexy.
  • To identify gaps in knowledge regarding the neural correlates of narcolepsy symptoms.
  • To highlight the potential of neuroimaging in understanding narcolepsy with cataplexy.

Main Methods:

  • Review of structural and functional brain imaging studies in narcoleptic patients.
  • Analysis of studies investigating neurotransmission and pharmacological effects.

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Manipulation of Epileptiform Electrocorticograms (ECoGs) and Sleep in Rats and Mice by Acupuncture
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Published on: December 22, 2016

Standardized Data Acquisition for Neuromelanin-Sensitive Magnetic Resonance Imaging of the Substantia Nigra
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Standardized Data Acquisition for Neuromelanin-Sensitive Magnetic Resonance Imaging of the Substantia Nigra

Published on: September 8, 2021

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Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood
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Measuring Neural Mechanisms Underlying Sleep-Dependent Memory Consolidation During Naps in Early Childhood

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Manipulation of Epileptiform Electrocorticograms (ECoGs) and Sleep in Rats and Mice by Acupuncture
09:06

Manipulation of Epileptiform Electrocorticograms (ECoGs) and Sleep in Rats and Mice by Acupuncture

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Standardized Data Acquisition for Neuromelanin-Sensitive Magnetic Resonance Imaging of the Substantia Nigra
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Standardized Data Acquisition for Neuromelanin-Sensitive Magnetic Resonance Imaging of the Substantia Nigra

Published on: September 8, 2021

  • Examination of research on hypothalamic and limbic system interactions.

    • Main Results:

    • Hypothalamic involvement is suggested in narcolepsy, potentially linked to hypocretin-orexin system dysfunction.
    • Cataplexy may arise from hypothalamic dysfunction and its connections with limbic structures.
    • Neural correlates of sleep attacks, hallucinations, and sleep paralysis remain largely unknown.

    Conclusions:

    • Neuroimaging is crucial for studying sleep regulation and disorders like narcolepsy.
    • Further neuroimaging research is needed to elucidate the neural basis of narcolepsy symptoms.
    • Future advancements in neuroimaging will enhance understanding of narcolepsy with cataplexy.