SLEEP DISORDERS AND SEVERITY OF ATTENTION-DEFICIT/HYPERACTIVITY DISORDER SYMPTOMS

Abstract

Introduction: Sleep disturbances are highly prevalent among children and adolescents with attention-deficit/hyperactivity disorder (ADHD). Difficulties initiating sleep, delayed circadian timing, insufficient or irregular sleep, sleep-disordered breathing, restless legs syndrome, and medication-related sleep changes may intensify inattention, emotional dysregulation, oppositional behavior, and functional impairment. However, subjective sleep complaints are more consistent than objective polysomnographic abnormalities, and the direction of the relationship remains complex.   Objective: To critically examine the association between sleep disorders and ADHD symptom severity in children and adolescents and to evaluate whether sleep-directed interventions improve sleep, ADHD manifestations, cognition, behavior, and daily functioning.   Methods: A structured narrative review was conducted using PubMed/MEDLINE, Scopus, Web of Science, and the Cochrane Library. Systematic reviews, meta-analyses, longitudinal studies, controlled sleep-manipulation experiments, randomized trials, and clinical guidelines were prioritized. Sleep phenotypes, measurement methods, directionality, medication effects, and treatment outcomes were analyzed separately.   Results: Children and adolescents with ADHD consistently exhibit more parent- and self-reported sleep problems than typically developing peers. Associations are strongest for sleep-onset difficulty, bedtime resistance, short or irregular sleep, difficult morning awakening, and daytime sleepiness. Actigraphy generally demonstrates longer sleep latency and lower sleep efficiency, whereas pooled polysomnographic findings are less consistent. Experimental sleep restriction aggravates parent-rated inattention, oppositionality, sleepiness, and affective instability, supporting a causal contribution of insufficient sleep to selected symptoms. Behavioral sleep interventions produce substantial improvement in sleep and modest reductions in ADHD symptom ratings. Melatonin improves sleep onset and circadian timing but has not consistently improved core ADHD symptoms. Adenotonsillectomy improves respiratory symptoms, sleepiness, quality of life, and caregiver-rated behavior in sleep-disordered breathing, although randomized trials have not shown superior objective attention or executive-function outcomes.   Conclusion: Sleep disturbance may mimic, amplify, result from, or coexist with ADHD. Its identification and treatment can remove a reversible component of impairment but should not be presented as a universal treatment for the neurodevelopmental disorder. Routine sleep screening, phenotype-specific investigation, medication review, and separate monitoring of nighttime and daytime outcomes should be integrated into ADHD care.