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Related Concept Videos

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:
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.
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...
Sedatives and Hypnotics: Overview01:23

Sedatives and Hypnotics: Overview

Sedatives are drugs that alleviate anxiety, while hypnotics induce sleep. Both classes of medication suppress neuronal activity, leading to a calming effect for sedatives and facilitating sleep for hypnotics.
Sedative-hypnotics are categorized into barbiturates, benzodiazepines (BZDs), and non-benzodiazepines or Z-drugs. These drugs work by suppressing central nervous system activity, and this suppression is dose-dependent. Older sedative medications, like barbiturates, follow a linear curve in...
Sedatives and Hypnotics Drugs: Miscellaneous Agents01:17

Sedatives and Hypnotics Drugs: Miscellaneous Agents

Sedatives and hypnotics encompass a wide range of substances, each with its unique mechanism of action, uses, and potential adverse effects.
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
Understanding Sleep01:11

Understanding Sleep

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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Related Experiment Video

Updated: Jul 20, 2026

Polygraphic Recording Procedure for Measuring Sleep in Mice
08:45

Polygraphic Recording Procedure for Measuring Sleep in Mice

Published on: January 25, 2016

Narcolepsy and the hypocretins.

Richard J Wurtman1

  • 1Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. dick@mit.edu

Metabolism: Clinical and Experimental
|September 19, 2006
PubMed
Summary

Narcolepsy, a neurologic disorder, involves excessive daytime sleepiness and REM sleep abnormalities. Research suggests hypocretin deficiency in the brain may cause these symptoms, impacting wakefulness regulation.

Area of Science:

  • Neurology
  • Sleep Medicine
  • Neuroscience

Background:

  • Narcolepsy is a chronic neurological disorder characterized by excessive daytime sleepiness, cataplexy, hallucinations, and sleep paralysis.
  • Genetic factors, including HLA antigen immune complex mutations, are associated with narcolepsy but are not solely causative.
  • A dog model revealed a mutation affecting hypocretin processing, a peptide neurotransmitter crucial for wakefulness.

Purpose of the Study:

  • To investigate the role of hypocretin deficiency in the pathophysiology of human narcolepsy.
  • To explore the link between reduced hypocretin levels and the inappropriate occurrence of REM sleep during wakefulness.

Main Methods:

  • Analysis of cerebrospinal fluid (CSF) hypocretin levels in narcoleptic patients.

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Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice
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Last Updated: Jul 20, 2026

Polygraphic Recording Procedure for Measuring Sleep in Mice
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Polygraphic Recording Procedure for Measuring Sleep in Mice

Published on: January 25, 2016

Simultaneous Electroencephalography, Real-time Measurement of Lactate Concentration and Optogenetic Manipulation of Neuronal Activity in the Rodent Cerebral Cortex
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Simultaneous Electroencephalography, Real-time Measurement of Lactate Concentration and Optogenetic Manipulation of Neuronal Activity in the Rodent Cerebral Cortex

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Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice

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  • Histopathological examination to assess hypocretin-containing neurons in the brain.
  • Review of genetic associations, including HLA subtypes and their potential role in immune-mediated neuronal damage.

    • Main Results:

    • Profoundly depressed hypocretin levels were observed in the CSF of narcoleptic patients.
    • A significant reduction in hypocretin-containing neurons was identified in narcoleptic brains.
    • Hypothesis suggests HLA subtypes may predispose hypocretin neurons to immune attack, leading to wakefulness disruption.

    Conclusions:

    • Narcolepsy is strongly associated with a deficiency in the neurotransmitter hypocretin.
    • Loss of hypocretin neurons likely contributes to the dysregulation of REM sleep and associated symptoms in narcolepsy.
    • This neurotransmitter deficiency model offers insights into narcolepsy, similar to dopamine in Parkinson's disease.