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Related Concept Videos

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...
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:
REM Sleep Behavior Disorder01:15

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...
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...
Sleepwalking and Sleep Talking01:17

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...
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...

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Updated: May 25, 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

REM sleep instability--a new pathway for insomnia?

D Riemann1, K Spiegelhalder, C Nissen

  • 1Department of Psychiatry and Psychotherapy, Freiburg University Medical Center, Freiburg, Germany. dieter.riemann@uniklinik-freiburg.de

Pharmacopsychiatry
|February 1, 2012
PubMed
Summary
This summary is machine-generated.

REM sleep instability, marked by increased arousals, may explain why insomnia patients feel sleep is non-restorative. This fragmentation could also link to emotional and cognitive issues, increasing depression risk.

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Area of Science:

  • Neuroscience
  • Sleep Medicine
  • Psychiatry

Background:

  • Chronic insomnia affects 10% of adults, causing daytime impairments and increasing risks for mental and physical disorders.
  • Existing models suggest persistent hyperarousal but don't fully explain the gap between objective sleep data and subjective patient experience.
  • The role of Rapid Eye Movement (REM) sleep instability in insomnia's subjective severity remains unclear.

Purpose of the Study:

  • To propose REM sleep instability as a key factor contributing to the subjective experience of disrupted, non-restorative sleep in chronic insomnia.
  • To explore how REM sleep fragmentation might explain the discrepancy between objective sleep measures and patient-reported outcomes.
  • To investigate the potential link between REM sleep fragmentation, emotional network dysfunction, and the increased risk of depression in insomnia.

Main Methods:

  • Reviewing evidence on micro- and macro-arousals during REM sleep in insomnia patients.
  • Applying the continuity hypothesis of dream production to understand dream content in insomnia.
  • Examining the proposed neurobiological consequences of REM sleep fragmentation on emotional and executive brain networks.

Main Results:

  • Insomnia patients exhibit increased micro- and macro-arousals during REM sleep, suggesting REM sleep instability.
  • Pre-sleep concerns may dominate dream content due to enhanced REM sleep arousal, leading to recall of disrupted sleep.
  • Chronic REM sleep fragmentation may impair ventral emotional networks and attenuate dorsal executive networks.

Conclusions:

  • REM sleep instability is a significant contributor to the subjective experience of non-restorative sleep in chronic insomnia.
  • Fragmented REM sleep may facilitate conscious recall of worry-dominated dreams, exacerbating sleep disruption.
  • REM sleep fragmentation could underlie emotional and cognitive deficits, elevating depression risk in individuals with insomnia.