Sleep and behaviour disturbance in Prader-Willi syndrome: a questionnaire study.
Daytime sleepiness is an early, treatable trigger for behavior problems in Prader-Willi syndrome.
01Research in Context
What this study did
Parents filled out a sleep and behavior survey. The team compared answers from families with Prader-Willi syndrome to matched families without the syndrome.
They wanted to know if sleep problems and behavior issues show up together in PWS.
What they found
Daytime sleepiness stood out. Kids and adults with PWS felt sleepy during the day far more often than controls.
More sleepiness went hand-in-hand with more behavior trouble, even when weight was stable.
How this fits with other research
H-Hatton et al. (2004) later showed behavior keeps getting worse in teens and young adults with PWS, especially if BMI rises. The 1999 sleep link now looks like part of a longer story: poor sleep starts early, then behavior snowballs.
Fullana et al. (2007) added IQ-matched groups and found the behavior spike is not just “low IQ.” It is PWS-specific. Together the three papers draw a line from sleepiness to rising behavior risk across the lifespan.
S-Heald et al. (2020) updated the picture with a national sample. Over half of Irish people with PWS now carry a psychiatric diagnosis, yet wait lists stretch almost two years. The 1999 warning about hidden sleep problems feels even more urgent today.
Why it matters
If you serve clients with Prader-Willi, treat daytime sleepiness as a red flag. Ask about naps, snoring, and night waking at every visit. A quick sleep screen can head off bigger behavior storms later.
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02At a glance
03Original abstract
The present authors describe sleep problems, including sleep apnoea and excessive daytime sleepiness (EDS), in subjects with Prader-Willi syndrome (PWS). The present paper reports a questionnaire study regarding sleep and behaviour in a group of 29 subjects with PWS, compared with an age- and gender-matched control group. Those with PWS suffered from sleep problems more frequently than the control subjects. Problems included EDS, snoring and early waking. Sleep problems in PWS were not associated with body mass index or weight. Excessive daytime sleepiness was a distinctive feature of the group with PWS, and behavioural disturbance in PWS children and adolescents was associated with EDS. Excessive daytime sleepiness seems to be characteristic of PWS, and may be related to problems with the sleep-wake cycle and hypothalamic dysfunction.
Journal of intellectual disability research : JIDR, 1999 · doi:10.1046/j.1365-2788.1999.043005380.x