Perspective Chapter: The Impact of Circadian Rhythm Dysregulation in the Treatment Resistance and Medication Efficacy of ADHD across the Lifespan

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This work explores how circadian rhythm dysregulation (CRD) affects individuals with Attention-Deficit/Hyperactivity Disorder (ADHD), focusing on its impact on comorbidities, treatment resistance, and the effectiveness of medications from early childhood through young adulthood. ADHD is increasingly understood not only as a neurodevelopmental condition but also as one often marked by misalignment of internal circadian rhythms. This misalignment contributes to sleep disturbances, which in turn can aggravate core symptoms such as inattention, impulsivity, emotional dysregulation, and executive dysfunction. CRD interferes with treatment in several ways. The circadian system influences how medications are absorbed and metabolized, meaning that individuals with disrupted rhythms may experience reduced efficacy or stronger side effects depending on the timing of administration. Sleep deprivation and altered melatonin cycles can further limit the benefits of stimulant treatments. ADHD frequently coexists with sleep and mood disorders, as well as metabolic disturbances, which make treatment more complex and call for individualized care. The effects of circadian disruption also change over the course of development: in early childhood, it can intensify hyperactivity; in school-age children, it can impair learning and attention; in adolescents, phase delays and poor sleep hygiene complicate medication timing; and in young adults, irregular routines often worsen circadian misalignment and treatment response. Addressing CRD is therefore essential for improving clinical outcomes. Interventions such as light therapy, melatonin supplementation, sleep-focused behavioral strategies, and timing medications in line with circadian patterns offer promising avenues for more effective, personalized ADHD treatment.

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