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Establishing a Device for Sleep Deprivation in Mice

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Arousals in nocturnal groaning.

I Prihodova¹, K Sonka, D Kemlink

¹Department of Neurology, Charles University in Prague, General Teaching Hospital, Czech Republic. iva.prihodova@lf1.cuni.cz

|April 7, 2009

Summary

Nocturnal groaning (catathrenia) is linked to sleep disruption, with most episodes associated with arousals. Arousal mechanisms may play a role in this parasomnia.

Area of Science:

Sleep Medicine
Neurology
Parasomnias

Background:

Catathrenia, or nocturnal groaning, is a parasomnia characterized by vocalizations during prolonged expiration, primarily in REM sleep.
Its impact on sleep quality and microstructure remains unclear.
This study investigates the relationship between groaning episodes and sleep arousal events.

Purpose of the Study:

To assess the impact of nocturnal groaning on sleep microstructure, specifically the frequency of arousals relative to groaning episodes.
To analyze the frequency, duration, and sleep-stage distribution of groaning episodes.
To explore potential underlying mechanisms of catathrenia.

Main Methods:

Evaluation of eight patients diagnosed with nocturnal groaning using standard neurologic examination.

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Nocturnal videopolysomnography conducted over two consecutive nights to assess sleep parameters.

Separate counting of groaning episodes (bradypneic events) and their association with arousals.

Main Results:

Sleep macrostructure showed no significant changes.
A total of 725 groaning episodes were recorded, predominantly in REM sleep (76.5%).
63.3% of groaning episodes were associated with arousals, with arousal typically preceding or coinciding with the onset of groaning.

Conclusions:

Nocturnal groaning is frequently linked to sleep arousals, suggesting a potential source of sleep disruption.
The findings indicate that arousal mechanisms may be involved in the pathogenesis of catathrenia.
Further research is warranted to fully understand the clinical implications of this parasomnia.