Parent-reported periodic limb movement, sleep disordered breathing, bedtime resistance behaviors, and ADHD.

The purpose of this study was to compare the relative strength of association between symptoms of attention deficit/hyperactivity disorder (ADHD) with sleep disordered breathing (SDB), periodic limb movement disorder (PLMD), and bedtime resistance behaviors (BRBs). The Pediatric Sleep Questionnaire was completed by parents of 283 children. Scales were derived to indicate risk for specific sleep disorders, then correlated with symptoms of ADHD. Strong independent interrelationships between symptoms of PLMD and symptoms of ADHD emerged, with potential additional contributions by bedtime resistance. These interrelationships remained after controlling for age, SDB, sleepiness, or BRBs. These data suggest ADHD symptoms may be especially related to PLMD but that insufficient sleep duration secondary to bedtime resistance and noncompliance may make an independent contribution.