A Cross-Syndrome Comparison of Sleep-Dependent Learning on a Cognitive Procedural Task.
Sleep helps kids with Williams syndrome lock in a puzzle skill, but kids with Down syndrome need extra daytime practice instead.
01Research in Context
What this study did
Durbin et al. (2019) asked if sleep helps kids learn a puzzle task. They tested the children: 18 with Down syndrome, 18 with Williams syndrome, and 18 typically developing peers. Each child played a wooden tower puzzle in the lab, then either napped or stayed awake. The team compared scores before and after the break.
What they found
Typically developing kids and kids with Williams syndrome got faster after sleep. Kids with Down syndrome did not improve after sleep. Their scores stayed flat whether they napped or stayed awake. The gap was large enough that the authors say sleep learning 'does not work' for Down syndrome.
How this fits with other research
Vos et al. (2013) showed that kids with Down syndrome plan arm moves like peers, so the block-building problem is not weak hands. The sleep issue is in the brain, not the body.
Katz et al. (2003) found toddlers with Down syndrome try just as hard as mental-age matches on hard tasks. Anna’s result says the trying happens while awake; sleep won’t seal the deal.
Yu et al. (2023) report slower language growth in Down syndrome. Together, the papers paint a picture: learning in Down syndrome needs extra daytime reps, not overnight magic.
Why it matters
If you teach a new daily-living skill to a child with Down syndrome, pack the trials into the waking day. Don’t expect sleep to finish the job. Schedule the most important practice right before dinner, not at bedtime. For Williams syndrome, an afternoon nap can help, so let them rest after tough lessons.
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02At a glance
03Original abstract
Sleep plays a key role in the consolidation of newly acquired information and skills into long term memory. Children with Down syndrome (DS) and Williams syndrome (WS) frequently experience sleep problems, abnormal sleep architecture, and difficulties with learning; thus, we predicted that children from these clinical populations would demonstrate impairments in sleep-dependent memory consolidation relative to children with typical development (TD) on a cognitive procedural task: The Tower of Hanoi. Children with DS (n = 17), WS (n = 22) and TD (n = 34) completed the Tower of Hanoi task. They were trained on the task either in the morning or evening, then completed it again following counterbalanced retention intervals of daytime wake and night time sleep. Children with TD and with WS benefitted from sleep for enhanced memory consolidation and improved their performance on the task by reducing the number of moves taken to completion, and by making fewer rule violations. We did not find any large effects of sleep on learning in children with DS, suggesting that these children are not only delayed, but atypical in their learning strategies. Importantly, our findings have implications for educational strategies for all children, specifically considering circadian influences on new learning and the role of children's night time sleep as an aid to learning.
American journal on intellectual and developmental disabilities, 2019 · doi:10.1352/1944-7558-124.4.339