Relationship between poor sleep and daytime cognitive performance in young adults with autism.
Poor sleep quietly slows button-press speed in autistic young adults, even when accuracy looks fine.
01Research in Context
What this study did
Limoges et al. (2013) compared 20 autistic college students with 20 same-age peers without autism.
All wore a wrist watch that tracked sleep for one week. Then each person came to the lab for two short tests of attention and memory.
The team asked: does poorer sleep predict slower or less accurate thinking?
What they found
Autistic students slept less, woke more, and took longer to fall asleep than controls.
On lab tasks they pushed buttons more slowly, even when answers were correct.
Surprisingly, some sleep problems, like waking often, hurt memory scores only in the non-autistic group.
How this fits with other research
Taweesedt et al. (2025) extends this work to younger kids. They found big theta brain waves at sleep onset predicted worse emotion reading the next day.
Rzepecka et al. (2011) and Einfeld et al. (1996) came earlier and used parent surveys. They showed sleep and anxiety together forecast challenging behaviour, not slower thinking. Lab tasks versus parent reports explain the different focus.
Wang et al. (2024) tested an intervention. Exercise cut sleep latency and boosted flexible thinking in children with ADHD, showing the sleep-cognition link can move in both directions.
Why it matters
Even clients who say "I sleep fine" can have hidden poor sleep that drags down speed. A five-minute sleep screen plus one timed task can flag who needs a sleep referral before you tinker with teaching programmes.
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02At a glance
03Original abstract
Poor sleep is a common feature in autism even though patients themselves do not necessarily complain. The impact of poor sleep on daytime cognitive functioning in autism is not well-known and we therefore investigated whether sleep in autism correlates with daytime cognitive performance. A battery of non-verbal tasks was administered, in the morning after a second night of sleep in the laboratory, to 17 young adults with autism and normal intelligence, and 14 typically developed individuals matched for age and IQ; none of the participants complained about sleep problems. Two dimensions of attention (sustained and selective) and 4 types of memory (working, declarative, sensory-motor and cognitive procedural) were tested. Individuals with autism showed clear signs of poor sleep. Their performance differed from the controls in response speed but not in accuracy. Signs of poor sleep in the autism group were significantly correlated with either normal performance (selective attention and declarative memory) or performance inferior to that of the controls (sensory-motor and cognitive procedural memories). Both groups presented a significant negative correlation between slow-wave sleep (SWS) and learning a sensory-motor procedural memory task. Only control participants showed a positive association between SWS duration and number of figures recalled on the declarative memory task. Correlation patterns differed between groups when sleep spindles were considered: they were negatively associated with number of trials needed to learn the sensory-motor procedural memory task in autism and with reaction time and number of errors on selective attention in the controls. Correlation between rapid eye movements (REMs) in REM sleep and cognitive procedural memory was not significant. We conclude that some signs reflecting the presence of poor sleep in adults with high-functioning autism correlate with various aspects of motor output on non-verbal performance tasks. The question is raised whether poor sleep in non-complaining persons with autism should be treated.
Research in developmental disabilities, 2013 · doi:10.1016/j.ridd.2013.01.013