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Altered sleep-wake patterns in blindness: a combined actigraphy and psychometric study
1Department of Neuroscience, University of Montreal, Montreal, Quebec, Canada; BRAINlab and Neuropsychiatry Laboratory, Department of Neuroscience and Pharmacology, University of Copenhagen, Copenhagen, Denmark.
Sleep Medicine
|November 5, 2016
Summary
Blind individuals exhibit greater variability in sleep patterns and reduced sleep quality compared to sighted individuals. This variability in sleep efficiency and timing correlates with sleep disturbance severity, suggesting free-running circadian rhythms contribute to sleep issues in blindness.
Area of Science:
- Chronobiology
- Ophthalmology
- Sleep Medicine
Background:
- Light is crucial for synchronizing the internal biological clock with the environment's day/night cycle.
- Absence of vision is frequently linked to sleep disturbances and free-running circadian rhythms.
- Understanding sleep-wake patterns in blind individuals is essential for addressing associated health issues.
Purpose of the Study:
- To investigate the variability in sleep-wake patterns between blind and normal-sighted individuals.
- To compare sleep efficiency, timing, and quality in these two groups.
- To explore the relationship between sleep disturbances and circadian rhythmicity in blindness.
Main Methods:
- Thirty-day actigraphy recordings were obtained from 11 blind individuals and 11 age-/sex-matched sighted controls.
- Sleep parameters including rest episodes, sleep periods, and awakenings were extracted.
- Sleep quality (Pittsburgh Sleep Quality Index) and chronotype (Morningness-Eveningness Questionnaire) were also assessed.
Main Results:
- No overall group differences in sleep parameters were observed when averaged over 30 days.
- Blind participants showed significantly greater 30-day variability in sleep efficiency and night-time sleep timing compared to controls.
- Reduced sleep quality was confirmed in blind individuals, with variability correlating with disturbance severity.
Conclusions:
- Observed findings support the hypothesis that free-running circadian rhythms are a primary factor in sleep disturbances experienced by blind individuals.
- The timing and physiology of sleep are intrinsically linked to the endogenous circadian phase.
- Greater sleep variability in blind individuals highlights the critical role of light in circadian regulation and sleep.
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