Sleep disturbances and behavior in Smith-Magenis syndrome.
In SMS, treat sleep first—behavior problems shrink when nights improve.
01Research in Context
What this study did
Garayzábal et al. (2022) looked at the kids and teens with Smith-Magenis syndrome. They used sleep diaries, actigraphy, and parent checklists to see who had sleep problems and how bad the daytime behaviors were.
The team ran simple correlations to test if worse sleep lined up with worse behavior scores.
What they found
Six out of every ten youths met criteria for a sleep disorder. Nine out of ten scored in the clinical or borderline range for behavior problems.
The worse the sleep numbers, the higher the behavior-problem score. The link was strongest for self-injury and repetitive actions.
How this fits with other research
Wilkinson et al. (1998) first mapped the odd SMS behaviors—nail-yanking, 'lick-and-flip' page touching—and noted sleep trouble as the top predictor. Elena’s 2022 data update that picture with modern sleep measures and still show the same tight link.
Nuebling et al. (2024) meta-analysis looked across many genetic ID syndromes and found shorter, poorer sleep is the norm. Elena’s 60 % sleep-disorder rate in SMS sits right inside the high-risk band the meta flagged.
Taylor et al. (2017) meta-analysis showed behavioral sleep interventions give large, quick gains for people with ID. Elena’s study says SMS kids are prime candidates for those same bedtime, light, and schedule tricks.
Why it matters
Before you write a behavior plan, run a one-week sleep log and actigraphy. Fixing bedtime routines, morning light, and melatonin timing can drop the very behaviors you were about to treat with more intrusive tactics. Sleep is the first-tier intervention for SMS.
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02At a glance
03Original abstract
BACKGROUND: The Smith-Magenis syndrome (SMS) shows a collection of neurodevelopmental problems including mild to moderate intellectual disability, change-related anxiety, impulsivity, speech delay, Attention-Deficit/Hyperactivity Disorder (ADH) and sleep disturbances. Sleep disorders, when present, have been treated in several populations with consecutive improvements in cognitive and behavioral aspects. AIMS: To better understand the existing relationships between sleep disturbances and behavioral problems in SMS syndrome this study describes the sleep and behavior problems in the SMS and explores the possible relation between both. METHODS AND PROCEDURES: 17 individuals with SMS (50% males; 11.2 ± 4.9 years old) and 12 individuals with typical development (50% male; 11.1 ± 4.4 years old) were investigated using the Sleep Disturbance Scale for Children and the Child Behavior Checklist. RESULTS: A high percentage (60%) of individuals with SMS have an indication of sleep disorders, being the most frequent disorders the sleep-wake transition disorders, and disorders of initiating and maintaining sleep with sleep latency higher than acceptable and total sleep time below acceptable. More than 94% of the SMS group presented clinical or borderline scores on the total behavioral problems scale. The most common behavioral problems were Externalizing Problems, Thought and Attention, ADH and Aggressive problems. There was a positive correlation between disorders of initiating and maintaining sleep, sleep-wake transition disorders, disorders of arousal, disorders of excessive somnolence and behavioral problems. CONCLUSIONS AND IMPLICATIONS: The worse the sleep disturbances investigated, the more severe the behavioral problems characteristics reinforcing the importance to address the sleep problems in the treatment of SMS individuals.
Research in developmental disabilities, 2022 · doi:10.1016/j.ridd.2022.104286