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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:
Insufficient Sleep and Sleep Deprivation01:13

Insufficient Sleep and Sleep Deprivation

Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
Sleep deprivation is a more severe form of sleep loss...
Acute Respiratory Failure-IV01:23

Acute Respiratory Failure-IV

Respiratory failure can manifest suddenly or gradually, characterized by a rapid decline in PaO2 and a rapid rise in PaCO2. This situation indicates a severe respiratory problem that may quickly become a life-threatening emergency. One of the early signs of hypoxemic Acute Respiratory Failure (ARF) is a change in mental status due to the brain's sensitivity to oxygen levels and changes in acid-base balance. Symptoms such as restlessness, confusion, and agitation suggest inadequate oxygen...
Insomnia01:27

Insomnia

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...
Factors Affecting Respiration01:24

Factors Affecting Respiration

Respiration is a crucial physiological function involving exchanging oxygen (O2) and carbon dioxide (CO2) between an organism and its environment. Various factors can impact this essential process:
Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...

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Related Experiment Video

Updated: May 18, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
08:36

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

Published on: August 8, 2019

Sleep disturbance at altitude.

Jeremy S Windsor1, George W Rodway

  • 1University College London, Institute of Human Health Performance, Highgate Hill, London, UK. jswindsor@doctors.org.uk

Current Opinion in Pulmonary Medicine
|October 2, 2012
PubMed
Summary

Altitude exposure commonly disrupts sleep in lowland residents, with hypoxia playing a larger role than previously understood. Current treatments for altitude-related sleep disturbance are effective, but personalized approaches are needed.

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Last Updated: May 18, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
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Quantifying Infra-slow Dynamics of Spectral Power and Heart Rate in Sleeping Mice
10:56

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Published on: August 2, 2017

Area of Science:

  • Physiology
  • Sleep Medicine
  • Altitude Research

Background:

  • Lowland residents often experience sleep disturbances upon ascending to high altitudes.
  • Historically, periodic breathing was considered the primary cause of sleep disruption.
  • Recent evidence suggests hypoxia has a more significant impact on sleep at altitude.

Purpose of the Study:

  • To review the effects of altitude on sleep physiology.
  • To examine the underlying physiological mechanisms of sleep disturbance at altitude.
  • To describe current and emerging therapeutic interventions for altitude-induced sleep issues.

Main Methods:

  • Literature review of studies on altitude, sleep, and related physiology.
  • Analysis of recent research challenging previous hypotheses on sleep disturbance causes.
  • Identification and categorization of current therapeutic strategies.

Main Results:

  • Hypoxia, not solely periodic breathing, is increasingly recognized as a major factor in altitude-related sleep disturbance.
  • New therapeutic approaches target either the underlying hypoxia or the sleep disturbance symptoms directly.
  • Existing treatments are generally well-tolerated and successful, though comparative data is limited.

Conclusions:

  • Current interventions for altitude sleep disturbance are effective and safe for most individuals.
  • Future research should focus on tailoring treatments to individual needs and environmental conditions.
  • Personalized medicine approaches will likely optimize the management of sleep disturbances at altitude.