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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:
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.
The circadian rhythm, a nearly 24-hour cycle, is deeply influenced by environmental light cues. Light exposure directly affects the hypothalamus, which in turn regulates...
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...
Nightmares and Night Terrors01:18

Nightmares and Night Terrors

Nightmares and night terrors represent two distinct types of sleep disturbances that differ in timing, characteristics, and the sleeper's recall of the event. Nightmares are vivid, disturbing dreams that usually awaken the sleeper from REM sleep, a stage of sleep where brain activity is high, and dreams are most frequent. Upon awakening, individuals often have detailed recollections of their nightmares, which can include themes of threats to survival, security, or self-esteem.
Nightmares often...
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...
Stages of Sleep01:22

Stages of Sleep

Sleep progresses through distinct stages, each characterized by specific brain wave patterns and physiological responses ranging from wakefulness to stages of non-rapid eye movement, known as non-REM, to rapid eye movement, referred to as REM. Understanding these stages helps in recognizing how sleep supports various bodily and cognitive functions.
Before sleep begins, in wakefulness, the brain exhibits primarily beta waves, which are high in frequency and low in amplitude, indicating alertness...

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Related Experiment Video

Updated: Jun 26, 2026

A Chronic Sleep Fragmentation Model using Vibrating Orbital Rotor to Induce Cognitive Deficit and Anxiety-Like Behavior in Young Wild-Type Mice
06:23

A Chronic Sleep Fragmentation Model using Vibrating Orbital Rotor to Induce Cognitive Deficit and Anxiety-Like Behavior in Young Wild-Type Mice

Published on: September 22, 2020

Sleep and critical care.

Jagdeep S Bijwadia1, Muhammad S Ejaz

  • 1Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, University of Minnesota, Minneapolis, Minnesota 55130, USA. bijwa001@umn.edu

Current Opinion in Critical Care
|January 31, 2009
PubMed
Summary

Intensive care unit (ICU) patients experience significant sleep disruption, a critical factor impacting health outcomes. This review examines the extent and implications of sleep disturbance in the ICU, highlighting the need for improved sleep interventions.

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Last Updated: Jun 26, 2026

A Chronic Sleep Fragmentation Model using Vibrating Orbital Rotor to Induce Cognitive Deficit and Anxiety-Like Behavior in Young Wild-Type Mice
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A Chronic Sleep Fragmentation Model using Vibrating Orbital Rotor to Induce Cognitive Deficit and Anxiety-Like Behavior in Young Wild-Type Mice

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Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea
07:54

Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea

Published on: December 6, 2016

Area of Science:

  • Critical care medicine
  • Sleep science
  • Patient outcomes

Background:

  • Sleep distortion is a recognized risk factor for morbidity and mortality.
  • Intensive care unit (ICU) patients face unique psychological and physiological stressors impacting sleep.
  • The role of sleep disruption in ICU patient outcomes remains unclear.

Purpose of the Study:

  • To systematically review recent data on sleep disruption in ICU patients over the last decade.
  • To elaborate on the extent and implications of sleep disturbance in the ICU setting.
  • To discuss the effects of ICU-specific factors like ventilators and medications on sleep.

Main Methods:

  • Systematic review of recent scientific literature.
  • Analysis of data from the last ten years.
  • Inclusion of studies on sleep prevalence and patient outcomes in the ICU.

Main Results:

  • ICU patients consistently demonstrate poor sleep quality, a finding supported by decades of research.
  • Despite established prevalence, the implications of sleep distortion in this population are not fully understood.
  • Recent studies, including the Whitehall cohort trial, emphasize the link between sleep and mortality, increasing interest in ICU sleep disturbance.

Conclusions:

  • Sleep disruption is a significant issue for ICU patients, influenced by factors like mechanical ventilation and medications.
  • Further research is needed to fully understand the implications of sleep distortion in the ICU.
  • Interventions aimed at improving sleep quality in the intensive care setting are crucial and will be discussed.