The Bidirectional Relationship Between Sleep Disturbances and ADHD: A Narrative Review of Behavioral, Cognitive, and Neurobiological Mechanisms

Abstract

ADHD and sleep disturbances represent one of the most clinically significant yet incompletely understood comorbid relationships in contemporary psychiatry, in part because much of the previous literature has treated sleep disturbance as a downstream consequence of ADHD rather than as a potential contributing factor to symptom expression. This review presents an integrative bidirectional model that brings together behavioral, cognitive, and neurobiological findings on the ADHD–sleep relationship across the lifespan. A structured narrative synthesis was undertaken, informed by a systematic literature search of five bibliographic databases covering January 2010 to December 2024, with included studies organized according to a three-tier mechanistic framework (behavioral, cognitive, neurobiological) and a corresponding bidirectional model. Across pediatric, adolescent, and adult cohorts, sleep problems are reported in approximately 25–80% of individuals with ADHD, depending heavily on the operational definition and assessment modality used; sleep-onset latency is increased by roughly 15–30 minutes relative to controls in several studies; experimental sleep loss is associated with moderate-to-large cognitive decrements (Hedges’ g ≈ −0.32 to −0.78) in general-population samples, with preliminary evidence that individuals with high ADHD symptom loads may be disproportionately affected; and dim-light melatonin onset is delayed by approximately 1–1.5 hours, alongside reported associations with circadian clock-gene polymorphisms of modest and heterogeneous effect. The review offers an organizing framework for identifying modifiable sleep-related targets in ADHD case formulation and for designing chronotype-informed, non-pharmacological interventions, while explicitly acknowledging the predominantly correlational nature of the underlying evidence.