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Post-Ictal Sleep Changes in Human Focal Epilepsy.

Vaclav Kremen1,2, Vladimir Sladky3,2,4, Vaclav Gerla2

  • 1Department of Neurology, Mayo Clinic, Rochester, Minnesota 55905 kremen.vaclav@mayo.edu worrell.gregory@mayo.edu.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 29, 2026
PubMed
Summary

Seizures may strengthen epileptic networks during sleep. This study found altered sleep patterns after seizures, suggesting a process similar to memory consolidation, termed seizure-related consolidation (SRC).

Keywords:
focal epilepsylocal field potentialsseizure-related consolidationsleep architecturesleep–wake statesslow wave sleep

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Area of Science:

  • Neuroscience
  • Sleep Medicine
  • Epilepsy Research

Background:

  • The relationship between sleep, seizures, and epilepsy is not fully understood.
  • Seizures might reinforce pathological networks during post-ictal sleep via seizure-related consolidation (SRC).
  • Previous human studies on SRC are limited by small sample sizes and restricted sleep observations.

Purpose of the Study:

  • To investigate the interplay between seizures and sleep in focal epilepsy.
  • To analyze sleep-wake patterns and seizure occurrences using continuous intracranial recordings.
  • To examine post-ictal sleep changes and their localization within epileptogenic networks.

Main Methods:

  • Continuous local field potential (LFP) recordings were analyzed in 11 individuals with drug-resistant focal epilepsy.
  • Sleep-wake catalogs and seizure catalogs were derived from LFP data.
  • Post-ictal sleep metrics were compared to inter-ictal sleep metrics.

Main Results:

  • Post-ictal sleep showed reduced rapid-eye-movement (REM) sleep duration.
  • Increased slow-wave sleep duration, spectral power, and waveform slope were observed post-ictally.
  • These sleep changes were most pronounced within the epileptogenic networks.

Conclusions:

  • Post-ictal sleep alterations in focal epilepsy resemble physiological memory consolidation.
  • Findings support the concept of seizure-related consolidation (SRC) strengthening epileptic networks.
  • Results suggest potential therapeutic targets for disrupting post-ictal sleep and SRC in epilepsy.