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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:
Parkinson's Disease: Overview01:15

Parkinson's Disease: Overview

Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is to...
Parkinson's Disease: Treatment01:24

Parkinson's Disease: Treatment

Neurodegenerative disorders, such as Parkinson's Disease (PD), involve the gradual and irreversible destruction of neurons in particular brain areas. These disorders exhibit standard features like proteinopathies, selective vulnerability of some neurons, and an interaction of intrinsic properties, genetics, and environmental influences in neural injury.
Parkinson's Disease is primarily a result of the loss of dopaminergic neurons in the substantia nigra pars compacta. The cornerstone of its...
Parkinson Disease l: Introduction01:24

Parkinson Disease l: Introduction

Parkinson’s disease is a chronic, progressive neurodegenerative disorder that primarily affects movement. It is characterized by motor symptoms such as resting tremors, muscle rigidity, bradykinesia (slowness of movement), and postural instability. Patients may notice hand tremors at rest, stiffness during movement, or a shuffling gait. In addition to motor features, non-motor symptoms include sleep disturbances, mood and behavioral changes, constipation, and cognitive impairment, all of which...
Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...

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Related Experiment Video

Updated: Jun 12, 2026

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking
07:26

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking

Published on: September 26, 2019

Narcolepsy in Parkinson's disease.

Imran Z Haq1, Yogini Naidu, Prashanth Reddy

  • 1Guy's, King's & St Thomas' School of Medicine, King's College, London, UK.

Expert Review of Neurotherapeutics
|June 4, 2010
PubMed
Summary

Parkinson's disease patients with sleep issues may have low hypocretin-1 levels, potentially linked to hypothalamic damage. This suggests a connection between Parkinson's, narcolepsy, and sleep disturbances.

Area of Science:

  • Neuroscience
  • Sleep Medicine
  • Neurology

Background:

  • Non-motor symptoms, including sleep disturbances like excessive daytime sleepiness and REM sleep behavior disorder, are prevalent in Parkinson's disease (PD).
  • These sleep symptoms overlap with those seen in narcolepsy, a sleep-wake disorder.
  • Cerebrospinal fluid (CSF) hypocretin-1 deficiency is a key diagnostic marker for narcolepsy, reflecting hypothalamic hypocretin neuron loss.

Purpose of the Study:

  • To investigate the relationship between CSF hypocretin-1 levels and sleep symptoms in Parkinson's disease patients.
  • To explore whether hypocretin deficiency in PD is associated with hypothalamic neurodegeneration.

Main Methods:

  • Review of existing studies examining CSF hypocretin-1 levels in Parkinson's disease patients with and without sleep symptoms.

Related Experiment Videos

Last Updated: Jun 12, 2026

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking
07:26

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking

Published on: September 26, 2019

  • Comparison of hypocretin-1 levels between PD patients and control groups.
  • Assessment of potential correlation between hypocretin deficiency and hypothalamic damage.

    • Main Results:

    • Data on CSF hypocretin-1 levels in PD patients with sleep symptoms are conflicting, with most studies showing no significant decrease compared to controls.
    • Some studies indicate that hypocretin-1 deficiency is more pronounced in PD patients experiencing sleep symptoms.
    • Evidence suggests non-selective disruption of hypothalamic systems, with loss of melanin-concentrating hormone cells observed alongside hypocretin loss in some PD patients.

    Conclusions:

    • Hypocretin deficiency in Parkinson's disease may result from collateral damage to hypothalamic neurons due to the neurodegenerative process.
    • Understanding the potential for narcolepsy-like symptoms and hypocretin system involvement in PD is crucial for patient management and treatment considerations.
    • Dopamine D3 receptor agonists may offer therapeutic potential for managing certain symptoms.