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The effect of sleep fragmentation on daytime function

S E Martin1, H M Engleman, I J Deary

  • 1Respiratory Medicine Unit, Department of Medicine, Royal Infirmary, University of Edinburgh, Scotland.

American Journal of Respiratory and Critical Care Medicine
|April 1, 1996
PubMed
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Sleep fragmentation alone, even for one night, significantly impairs daytime function in normal individuals. This sleep disruption leads to increased daytime sleepiness, reduced mood, and decreased cognitive abilities like attention and mental flexibility.

Area of Science:

  • Sleep Medicine
  • Neuroscience
  • Cognitive Psychology

Background:

  • Sleep apnea/hypopnea syndrome is linked to impaired daytime function, potentially due to sleep fragmentation and hypoxemia.
  • The independent contribution of sleep fragmentation to daytime dysfunction requires further investigation.

Purpose of the Study:

  • To isolate and assess the effects of sleep fragmentation on daytime function in normal subjects.
  • To determine if sleep fragmentation alone can cause measurable deficits in cognitive performance and mood.

Main Methods:

  • Sixteen healthy subjects underwent two nights of polysomnography: one undisturbed and one with sleep fragmented by auditory stimuli.
  • Sleep fragmentation was titrated to EEG arousal (theta/alpha rhythm for >=3s).
  • Daytime assessments included psychometric testing (Trailmaking B, PASAT), mood scales, Multiple Sleep Latency Test (MSLT), and Maintenance of Wakefulness Test (MWT).

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Main Results:

  • Total sleep time remained similar between undisturbed and fragmented sleep conditions.
  • Sleep fragmentation significantly reduced sleep latency on MSLT and MWT, indicating increased daytime sleepiness.
  • Subjective mood (hedonic tone) and objective cognitive functions (mental flexibility, sustained attention) were impaired after sleep fragmentation.

Conclusions:

  • One night of sleep fragmentation in healthy individuals leads to objective and subjective impairments in daytime function.
  • Sleep fragmentation is a critical factor contributing to daytime dysfunction, independent of hypoxemia.
  • Findings highlight the importance of consolidated sleep for maintaining optimal cognitive performance and mood.