Many children have difficulty sleeping. But a disproportionate number of children
with special needs have sleep problems.
Anywhere from 49 to 89% of children with autism spectrum disorders, 25
to 50% of children with ADHD, and 34 to 86% of children with cognitive
impairments are estimated to experience sleep difficulties. Additionally children with other syndromes,
such as Angelman or Down syndromes, are also reported to have sleep
difficulties. But what is not known is
if the learning problems cause the sleep problems, or if the sleep problems
cause the learning problems. Dr. Bonuck
and her associates from the Albert Einstein College of Medicine attempted
to answer this question in a prospective study just published in Pediatrics by looking for an association
between sleep difficulties in young children with a later need for special
education services.
Prospective studies follow a specific population (or cohort)
over time, identify certain risk factors, and see how these factors affect
outcomes over time. The Avon Longitudinal Study of Parents and Children (also
known as ‘the Children of the 90s’ study) is one such cohort that had enrolled approximately
85% of pregnant women in Avon, England in 1991-1992, allowing for a large
population-based study. The initial
cohort in the study, which was used by Dr. Bonuck and her associates for their
research, comprised more than 13,000 infants, but children with any known condition
that might lead to a disability or was associated with a disability were excluded.
