Cross syndrome comparison of sleep problems in children with Down syndrome and Williams syndrome.
Actigraphy catches syndrome-specific sleep disruptions in Down and Williams syndromes that parent forms miss.
01Research in Context
What this study did
Ashworth et al. (2013) compared sleep in children with Down syndrome and Williams syndrome. They used wrist-watch actigraphy and parent forms to see how the two groups slept.
The team wanted to know if each syndrome had its own sleep signature. They also checked whether parents spotted the same problems the watches recorded.
What they found
Each syndrome showed its own pattern of night waking and timing. Total sleep time, however, did not differ between the groups.
Parents often missed the brief wake-ups the watches caught. Relying on forms alone would have hidden key disruptions.
How this fits with other research
Ferguson et al. (2020) extends this work. They showed that parent-noted sleep problems in toddlers with Down syndrome predict faster forgetting of new actions. Anna’s actigraphy warning now has a functional payoff: missed sleep signs may hurt learning.
Matson et al. (1999) used only parent forms in Prader-Willi syndrome and linked sleepiness to behavior issues. Anna’s data say that approach can miss wake-ups, so the 1999 study may under-count true disruption.
Wimpory et al. (2002) used actigraphy in autism and also found hidden fragmentation. Together with Anna, this creates a cross-syndrome theme: objective sleep measures reveal problems parents don’t report.
Why it matters
If you treat Down or Williams syndrome, add a week of actigraphy before you write a sleep plan. Forms alone can steer you toward the wrong target. Brief wake-ups that parents never see still break sleep cycles and may blunt learning the next day. A quick watch score gives you the full picture and saves weeks of trial-and-error bedtime plans.
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02At a glance
03Original abstract
Based on previous findings of frequent sleep problems in children with Down syndrome (DS) and Williams syndrome (WS), the present study aimed to expand our knowledge by using parent report and actigraphy to define sleep problems more precisely in these groups. Twenty-two school-aged children with DS, 24 with WS and 52 typically developing (TD) children took part in the study. Each child wore an actiwatch for a minimum of four nights and parents completed the Children's Sleep Habits Questionnaire (CSHQ). Sleep problems were common in both developmental disorders. Children with DS had the greatest sleep disruption, with frequent and longer night wakings as well as restlessness. Parents reported symptoms of sleep-disordered breathing and a range of other problems including grinding teeth, bedtime resistance and sleep anxiety. Children with WS had problems initiating sleep and parents also reported bed-wetting and body pain. Despite these problems, the mean actual sleep time, as measured by actigraphy, did not differ between the three groups. CSHQ reports were in agreement with actigraphy for children's sleep duration, but this was not the case for sleep latency, restlessness and the night wakings variables. Sleep problems in DS and WS are common and appear to be syndrome-specific. Due to the inaccuracy of parent report, it is recommended that children at risk undergo objective measures of sleep assessment.
Research in developmental disabilities, 2013 · doi:10.1016/j.ridd.2013.01.031