"Our findings should raise awareness among parents and physicians that if a child is sleeping poorly, they should delve deeper to see if there is an unrecognized respiratory-related sleep problem," said senior author Karen Bonuck, Ph.D., professor of family and social medicine and of obstetrics & gynecology and women's health at Einstein. "The best way to make sure this happens is by taking an interdisciplinary approach to the care of these children."
According to Dr. Bonuck, little was known about the co-occurrence of behavioral sleep problems and sleep-disordered breathing (SDB). She and her colleagues carried out this study to find the prevalence and duration of behavioral sleep problems and of SDB - and the rate at which they co-occur - in a large, population-based sample of children (aged 18 months to nearly 5 years). The researchers analyzed data on more than 11,000 children enrolled in the Avon Longitudinal Study of Parents and Children, a project based in the United Kingdom.
In response to mailed questionnaires, parents reported their child's snoring and apnea at 18, 30, 42, and 57 months of age. For the same time intervals, parents were also asked whether their child refused to go to bed, and whether they regularly woke early, had difficulty sleeping, had nightmares, got up after being put to bed, woke in the night, or awakened after a few hours. Children with five or more of these behaviors simultaneously were considered to have a clinically significant behavioral sleep problem.
The prevalence of behavioral sleep problems over the 18 to 57-month age reporting period ranged from 15 to 27 percent with a peak at 30 months of age. Among children with behavioral sleep problems, 26 to 40 percent had habitual SDB, again peaking at 30 months. Among children who had habitual SDB, 25 to 37 percent also had a behavioral sleep problem, peaking at 30 months.
While it is unlikely that behavioral sleep problems cause SDB, the converse may be true, noted Dr. Bonuck. Frequent night wakings initially related to SDB may be reinforced by the parents' anxious responses. These behaviors may, in turn, develop into a persistent behavioral sleep problem, despite adequate treatment for SDB.
"It's important that we pay attention to how our children are sleeping," said Dr. Bonuck. "There's ample evidence that anything that interrupts sleep can negatively affect a child's emotional, cognitive, behavioral and academic development. Fortunately, snoring and apnea are highly treatable, and there are many effective interventions for behavioral sleep problems."
The paper is titled "Co-morbid symptoms of sleep disordered breathing and behavioral sleep problems from 18 - 57 months of age: A population-based study." The lead author is Melisa Moore, Ph.D. (Children's Hospital of Philadelphia, PA.)
The authors declare no conflict of interest. The research was supported in part by a grant from the National Heart, Lung, and Blood Institute (R21HL091241), part of the National Institutes of Health.
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