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Atypical sleep architecture and the autism phenotype
Elyse Limoges1, Laurent Mottron, Christianne Bolduc
1Centre de Recherche Fernand-Seguin, Neurodevelopmental Disorders Program, Hôpital Rivière-des-Prairies, Montréal, Québec, Canada.
Brain : a Journal of Neurology
|February 12, 2005
Summary
Sleep disturbances are a key characteristic of autism spectrum disorder (ASD) in adults. Objective and subjective sleep measures reveal significant differences in sleep architecture for individuals with ASD.
Area of Science:
- Neuroscience
- Sleep Medicine
- Psychiatry
Background:
- Autism spectrum disorder (ASD) is increasingly associated with sleep disorders.
- Atypical sleep architecture is frequently observed in individuals with ASD.
Purpose of the Study:
- To determine if sleep disorders are an intrinsic feature of the autism spectrum disorder (ASD) phenotype.
- To objectively and subjectively assess sleep patterns in high-functioning adults with ASD without other comorbidities.
Main Methods:
- Compared subjective sleep data from 27 adults with ASD to 78 age- and gender-matched controls.
- Conducted objective laboratory sleep recordings on a subset of 16 ASD participants and 16 controls.
- Administered clinical scales including the Beck Depression Inventory and Spielberger Anxiety Scale.
Main Results:
- Adults with ASD exhibited longer sleep latency, more nocturnal awakenings, and lower sleep efficiency.
- Objective findings included increased stage 1 sleep, decreased non-REM and slow-wave sleep, fewer sleep spindles, and reduced REM activity.
- Higher trait anxiety scores were noted in the ASD group, with total sleep time negatively correlating with social and communication deficits.
Conclusions:
- Atypical sleep patterns are a significant feature of the adult ASD phenotype.
- Findings suggest an atypical organization of neural networks involved in sleep regulation in ASD.
- Further investigation in younger populations and detailed EEG analysis are warranted.