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Related Concept Videos

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...
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...
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...
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:
Sedatives and Hypnotics Drugs: Benzodiazepines01:19

Sedatives and Hypnotics Drugs: Benzodiazepines

Benzodiazepines have both sedative and hypnotic properties. They include compounds such as diazepam (Valium) and alprazolam (Xanax). Structurally, their cores are similar, consisting of the fusion of a benzene ring and a diazepine ring, but they share a common mechanism of action in the central nervous system (CNS).
Benzodiazepines work by enhancing the effects of the inhibitory neurotransmitter GABA. They bind to the GABAA receptor, increasing its affinity for GABA, which opens chloride...
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...

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Related Experiment Video

Updated: Jun 13, 2026

Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention
08:49

Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention

Published on: October 16, 2013

Motor Cortex VIP Interneurons Participate in Dexmedetomidine-Associated Sleep Modulation.

Wei Wang1, Hanmei Zhang2, Tianqi Zhang1

  • 1Department of Physiology, School of Basic Medical Sciences, Anhui Medical University, Hefei, 230032, Anhui, China.

Molecular Neurobiology
|June 12, 2026
PubMed
Summary
This summary is machine-generated.

Vasoactive intestinal peptide (VIP)-expressing neurons in the motor cortex show higher activity during the day. Inhibiting these neurons reduces the sleep-promoting effects of dexmedetomidine.

Keywords:
DexmedetomidineMotor cortexSleep-state regulationVIP neuronsα2-adrenergic receptor

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Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons
09:04

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons

Published on: September 14, 2016

Related Experiment Videos

Last Updated: Jun 13, 2026

Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention
08:49

Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention

Published on: October 16, 2013

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons
09:04

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons

Published on: September 14, 2016

Area of Science:

  • Neuroscience
  • Sleep Science
  • Cortical circuits

Background:

  • Vasoactive intestinal peptide (VIP)-expressing neurons in the motor cortex (MC) show diurnal excitability variations.
  • These neurons may influence sleep architecture.

Purpose of the Study:

  • To investigate the role of MCVIP neurons in sleep-wake modulation.
  • To determine if dexmedetomidine (Dex) engages MCVIP neurons.

Main Methods:

  • Utilized chemogenetic approaches to inhibit MCVIP neurons.
  • Performed slice electrophysiology to record neuronal excitability and synaptic currents.
  • Administered Dex and assessed its effects on MCVIP neuron activity.

Main Results:

  • MCVIP neurons exhibited higher excitability during the light phase.
  • Dex increased MCVIP neuronal excitability via α2-adrenergic receptors.
  • Dex reduced spontaneous inhibitory postsynaptic current (sIPSC) frequency and increased excitatory drive onto MCVIP neurons.
  • Inhibiting MCVIP neurons attenuated Dex-induced non-rapid eye movement (NREM) sleep prolongation.

Conclusions:

  • MCVIP neurons are involved in the temporal modulation of Dex-related sleep changes.
  • α2-adrenergic receptor signaling influences MCVIP neuron electrophysiology.