Sleep disorders in rare genetic syndromes: a meta-analysis of prevalence and profile.
Georgie Agar, Chloe Brown, Daniel Sutherland and 3 others
PMID 33632309WHAT IT FOUND
Sleep disorders are common in rare genetic syndromes, but the type varies by syndrome.
Screen for breathing issues in Mucopolysaccharidosis II, daytime sleepiness in Smith-Magenis, and insomnia broadly. Do not treat all poor sleep as behavioural.
Key findings
01Pooled prevalence estimates for specific sleep disorders varied widely between and within syndromes, ranging from 26% for sleep bruxism to 45% for insomnia.
02Relative risk of sleep-related breathing difficulties was significantly higher in Mucopolysaccharidosis II (77%) than in Down (32%) and Prader-Willi (43%) syndromes.
03The risk of having ‘general’ sleep difficulties was highest in Smith-Magenis syndrome (95%), while insomnia showed no significant difference in relative risk between syndromes.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The meta-analysis only included syndromes with existing data, potentially missing rarer syndromes with sleep issues. Many studies reported ‘general’ sleep difficulties rather than specific diagnoses, making it hard to pinpoint the exact disorder. Prevalence estimates were compared to typically developing norms from the literature rather than concurrent control groups, which may introduce bias. Study quality varied significantly, and poor methodology in some studies may have inflated prevalence estimates.
Declared interests
The paper does not list specific funding sources or conflicts of interest in the provided text.
The easy way to misread this
Do not assume all sleep problems in these syndromes are behavioural or inevitable. The study shows that specific biological disorders, like sleep apnoea in Mucopolysaccharidosis II or excessive daytime sleepiness in Smith-Magenis, are prevalent and require different medical assessments than standard sleep hygiene advice.