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Narcolepsy

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 Cycles

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:

Sleep Apnea

Sleep Apnea

Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
The condition is more prevalent among...

REM Sleep Behavior Disorder

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...

Management of Insomnia

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...

Sleepwalking and Sleep Talking

Sleepwalking and Sleep Talking

Somnambulism, commonly known as sleepwalking, involves individuals engaging in activities ranging from simple walking to more complex behaviors such as driving. Sleepwalking typically occurs during the slow-wave sleep stages 3 and 4 early in the night when the person is not dreaming, contradicting the myth that sleepwalkers are acting out their dreams.
Factors that increase the likelihood of sleepwalking include sleep deprivation and alcohol consumption. Contrary to common beliefs, it is safe...

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Related Experiment Video

Updated: Mar 16, 2026

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

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

Published on: December 22, 2016

[NARCOLEPSY WITH CATAPLEXY: TYPE 1 NARCOLEPSY].

Yves Dauvilliers, Régis Lopez

La Revue Du Praticien

|August 20, 2016

Summary

Narcolepsy type 1 is a rare sleep disorder characterized by excessive daytime sleepiness and cataplexy. Low hypocretin-1 levels in cerebrospinal fluid are highly specific for diagnosis.

Area of Science:

Neurology
Sleep Medicine
Immunology

Context:

Narcolepsy type 1 (NT1) is a rare, disabling neurological sleep disorder.
Characterized by excessive daytime sleepiness and cataplexy, often starting in the second decade of life.
Associated symptoms include hypnagogic hallucinations, sleep paralysis, and disturbed nighttime sleep.

Purpose:

To summarize the diagnostic criteria and underlying pathophysiology of narcolepsy type 1.
To highlight the role of hypocretin-1/orexin-A deficiency in NT1.
To discuss potential autoimmune triggers and genetic predispositions.

Summary:

NT1 diagnosis is clinical, supported by polysomnography showing short sleep latency and REM periods.
Low cerebrospinal fluid hypocretin-1/orexin-A levels (<110 pg/mL) are highly specific for NT1.

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Published on: September 22, 2020

Polygraphic Recording Procedure for Measuring Sleep in Mice

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The pathophysiology involves hypocretin neuron loss, likely due to an autoimmune process on a genetic background, possibly triggered by environmental factors like infections or vaccines.

Impact:

Inclusion of hypocretin-1 levels in diagnostic criteria improves NT1 identification.
Understanding the autoimmune basis may lead to targeted therapies.
Research into genetic and environmental factors can inform prevention strategies.