Abnormal sleep physiology in children with 15q11.2-13.1 duplication (Dup15q) syndrome.
Vidya Saravanapandian, Divya Nadkarni, Sheng-Hsiou Hsu and 8 others
PMID 34344470WHAT IT FOUND
Children with Dup15q syndrome had abnormal overnight sleep brain waves.
They showed more beta activity, a fast brain-wave pattern, fewer spindles, and less deep slow-wave sleep than matched controls. Some had no detectable slow-wave sleep. This was a small study, not a treatment trial.
Key findings
01During overnight sleep, children with Dup15q syndrome had significantly higher beta brain-wave power than age-matched neurotypical controls in frontal, central, and occipital regions.
02Children with Dup15q syndrome had significantly fewer sleep spindles than neurotypical controls, whether spindles were counted automatically or manually.
03Children with Dup15q syndrome had significantly less slow-wave sleep than controls, and 9 of 15 Dup15q children did not demonstrate stage N3 slow-wave sleep on manual scoring.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The sample was small and retrospective: 27 children total, with only 15 children with Dup15q syndrome. Most data came from clinical EEGs rather than full polysomnograms, so PSG-level sleep staging was limited and REM sleep was not evaluated. The study did not measure behaviour, cognition, speech, language, or daily function, so it cannot show how these sleep differences affect a child's day-to-day abilities. Children in the Dup15q group had different epilepsy statuses, spike-wave indices, and medications, but the study could not separate the effects of epilepsy, seizure activity, or medication on sleep brain waves. The control group consisted of children admitted for non-epileptic spells with normal EEGs, not a general population sample. The paper did not test whether improving sleep changes development or behaviour.
Declared interests
Funding came from the Dup15q Alliance, the National Institute of Health, and an Intellectual and Developmental Disabilities Research Center. The text does not report author conflicts of interest.
The easy way to misread this
Do not read the sleep brain-wave differences as proof that a sleep treatment will improve development. The study measured only EEG patterns in 27 children and did not test an intervention or relate sleep findings to speech, cognition, or daily function.