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Epilepsy and Seizures: Overview

Epilepsy and Seizures: Overview

Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
Various factors can trigger epilepsy, including genetic factors, brain damage, metabolic causes, and unknown etiology. Diagnosis of epilepsy involves electroencephalography (EEG), which...

Epilepsy ll: Types

Epilepsy ll: Types

Recurrent seizures, stemming from abnormal electrical activity in the brain, are the defining characteristic of epilepsy, a chronic neurological condition. Because seizure features vary greatly, epilepsy is classified using two systems: by seizure type and by epilepsy syndromes. These classifications enable clinicians to describe seizure patterns and select suitable treatment strategies.I. Classification by Seizure Type1. Focal EpilepsyFocal epilepsy begins in one hemisphere of the brain.

Seizures l: Introduction

Seizures l: Introduction

Understanding seizures and epilepsy relies on key definitions that help in recognizing, classifying, and managing these disorders. These definitions provide a framework for recognizing, classifying, and managing seizure disorders.DefinitionsA seizure is a sudden, abnormal burst of electrical activity in the brain that can cause changes in awareness, movement, sensation, or behavior, depending on the area involved. Epilepsy is a chronic condition characterized by recurrent, unprovoked seizures,...

Seizures: Classification

Seizures: Classification

Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:

Narcolepsy

Narcolepsy

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.

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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
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Related Experiment Video

Updated: May 8, 2026

Manipulation of Epileptiform Electrocorticograms (ECoGs) and Sleep in Rats and Mice by Acupuncture

Manipulation of Epileptiform Electrocorticograms (ECoGs) and Sleep in Rats and Mice by Acupuncture

Published on: December 22, 2016

[Epilepsy and sleep].

Zhurnal Nevrologii I Psikhiatrii Imeni S.S. Korsakova

|September 3, 2013

Summary

This study investigated nocturnal seizures in 200 epilepsy patients, finding that nearly half began with night-time seizures. It also highlighted the frequent misdiagnosis of parasomnias as epilepsy, emphasizing the need for accurate sleep-related seizure evaluation.

Area of Science:

Neurology
Sleep Medicine
Epileptology

Background:

Nocturnal seizures are a significant feature of epilepsy, impacting diagnosis and treatment.
Differentiating epileptic seizures from parasomnias during sleep is clinically challenging.

Purpose of the Study:

To analyze the characteristics of nocturnal seizures in epileptic patients.
To investigate the relationship between sleep and epilepsy.
To identify and differentiate parasomnias that mimic nocturnal epileptic seizures.

Main Methods:

Study included 200 epileptic patients with nocturnal seizures.
Evaluations comprised medical history, clinical/neurological exams, EEG/video-EEG monitoring, and brain MRI.
Observation period ranged from 6 months to 10 years (average 3.5 years).

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Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy

Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy

Published on: December 6, 2016

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Last Updated: May 8, 2026

Manipulation of Epileptiform Electrocorticograms (ECoGs) and Sleep in Rats and Mice by Acupuncture

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Published on: December 22, 2016

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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Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy

Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy

Published on: December 6, 2016

Main Results:

Epilepsy onset with nocturnal seizures occurred in 48% of cases.
In 30.5%, all seizures persisted during sleep.
Nocturnal seizures differed from waking seizures in 25% of patients, and 8.5% exhibited nocturnal non-epileptic seizures.

Conclusions:

Nocturnal seizures have diverse presentations in epilepsy.
Parasomnias can be mistaken for epileptic seizures, necessitating careful differential diagnosis.
Understanding the interplay between sleep and epilepsy is crucial for effective patient management.