Related Experiment Video
Updated: Jul 22, 2026
08:45
Polygraphic Recording Procedure for Measuring Sleep in Mice
Published on: January 25, 2016
Hypersomnia associated with bilateral posterior hypothalamic lesion. A polysomnographic case study
I Eisensehr1, S Noachtar, C von Schlippenbach
1Department of Neurology, University of Munich, Munich, Germany. eisen@nefo.med.uni-muenchen.de
European Neurology
|March 21, 2003
Summary
A posterior hypothalamic lesion caused excessive sleep in an obese patient. This suggests the posterior hypothalamus is crucial for maintaining wakefulness in humans, mirroring animal study findings.
Area of Science:
- Neuroscience
- Sleep Medicine
Background:
- The posterior hypothalamus is implicated in regulating arousal and wakefulness.
- Understanding the role of specific brain regions in sleep-wake regulation is essential for diagnosing and treating sleep disorders.
Observation:
- A 58-year-old obese patient presented with a bilateral posterior hypothalamic lesion of unknown cause.
- Polysomnography showed significantly prolonged total sleep time (17.6 hours) with only three brief wake periods during the day.
- Rapid eye movement (REM) sleep occurred exclusively between 5 p.m. and 6 a.m.
Findings:
- The patient exhibited hypersomnia, characterized by excessive daytime sleepiness and prolonged sleep duration.
- The lesion in the posterior hypothalamus correlated with disrupted wakefulness patterns and altered sleep architecture.
- The timing of REM sleep suggests a potential disruption of circadian rhythm regulation.
Implications:
- These findings support the critical role of the posterior hypothalamus in maintaining human wakefulness.
- The results align with animal studies demonstrating the hypothalamus's function in arousal.
- Further research into hypothalamic lesions may offer insights into novel therapeutic targets for hypersomnia and other sleep disorders.
More Related Videos
06:23A 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
04:33Association Between Sleep Quality and Cognitive Symptoms in Patients with Major Depressive Disorder
Published on: April 26, 2024
Related Concept Videos
01:24Sleep-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:
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
01:19Management 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...
01:17Sedatives 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...
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...
01:15REM 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...
RBD is significantly associated with...
01:07Narcolepsy
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.
01:24Substance Use Disorders Affecting Sleep
Substance use disorders involve a pattern of using drugs more extensively than intended and continuing use despite harmful consequences. This includes legal substances like alcohol and nicotine, as well as illegal drugs. These disorders often involve both physical and psychological dependence, reflecting compulsive use of substances that significantly alter thoughts, feelings, and behaviors, contributing to a major public health issue.
Understanding the concepts of physical dependence,...
Understanding the concepts of physical dependence,...