Sleep Architecture and EEG Power Spectrum Following Cumulative Sleep Restriction: A Comparison between Typically
Tamara Speth1, Benjamin Rusak1,2, Tara Perrot1
1Department of Psychology & Neuroscience, Dalhousie University, Halifax, NS B3H 4R2, Canada.
Insights
Cumulative sleep restriction in children impacts sleep architecture, particularly for those with ADHD. This study suggests impaired homeostatic processes in ADHD children under sleep restriction.
Area of Science:
- Pediatric Sleep Medicine
- Neurodevelopmental Disorders
Background:
- Limited research exists on cumulative sleep restriction (CSR) effects on sleep architecture and EEG power spectrum in school-aged children.
- Children with ADHD often experience sleep difficulties, yet their response to CSR remains understudied.
Purpose of the Study:
- To investigate the impact of CSR on sleep architecture and EEG power spectrum in typically developing (TD) children and children with ADHD.
- To compare sleep patterns between TD and ADHD children under typical and restricted sleep conditions.
Main Methods:
- A cohort of 18 TD and 18 age/sex-matched ADHD children (6-12 years) underwent a two-week baseline followed by two randomized conditions: Typical sleep and CSR (1-hour reduction).
- Polysomnography (PSG) was used to record sleep architecture and sleep EEG.
- Analysis of variance (ANOVA) was employed to compare sleep parameters between groups and conditions.
Main Results:
- Children with ADHD exhibited longer latency to N3 sleep, increased wake after sleep onset (WASO) in early night, and more REM sleep than TD children, irrespective of condition.
- During CSR, ADHD participants showed reduced REM sleep and a trend towards increased N1 and N2 sleep durations compared to TD children.
- No significant differences in the sleep EEG power spectrum were observed between groups or conditions.
Conclusions:
- The CSR protocol affected specific physiological sleep aspects but did not alter the sleep EEG power spectrum.
- Preliminary findings suggest potential impairments in homeostatic sleep processes among children with ADHD during CSR.
- Further research is needed to fully elucidate the long-term effects of sleep restriction on children's sleep physiology, especially in neurodevelopmental disorders.
Abstract:
No studies have looked at the effects of cumulative sleep restriction (CSR) on sleep architecture or the power spectrum of sleep EEG (electroencephalogram) in school-age children, as recorded by PSG (polysomnography). This is true for both typically developing (TD) children and children with ADHD (attention deficit/hyperactivity disorder), who are known to have more sleep difficulties. Participants were children (ages 6-12 years), including 18 TD and 18 ADHD, who were age- and sex-matched. The CSR protocol included a two-week baseline and two randomized conditions: Typical (six nights of sleep based on baseline sleep schedules) and Restricted (one-hour reduction of baseline time in bed). This resulted in an average of 28 min per night difference in sleep. Based on ANOVAs (analysis of variance), children with ADHD took longer to reach N3 (non-rapid eye movement), had more WASO (wake after sleep onset) (within the first 5.1 h of the night), and had more REM (rapid eye movement) sleep than TD children regardless of condition. During CSR, ADHD participants had less REM and a trend toward longer durations of N1 and N2 compared to the TD group. No significant differences in the power spectrum were found between groups or conditions. In conclusion, this CSR protocol impacted some physiological aspects of sleep but may not be sufficient to cause changes in the power spectrum of sleep EEG. Although preliminary, group-by-condition interactions suggest that the homeostatic processes in children with ADHD may be impaired during CSR.
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