Disrupted Cortico-Striato-Thalamo-Cortical Circuitry and Sleep Disturbances in Obsessive-Compulsive Spectrum, Chronic Tic, and Attention-Deficit/Hyperactivity Disorders.

The bidirectional relationship between sleep and obsessive-compulsive spectrum disorders (OCSDs), chronic tic disorders (CTDs), and attention-deficit/hyperactivity disorder (ADHD) is not well understood. To better treat individuals with these co-occurring sleep and developmental neuropsychiatric conditions, it is necessary to determine the common neural underpinnings to then target with treatment. Research has implicated dysregulated cortico-striatal-thalamo-cortical (CSTC) neurocircuitry in the development of CTDs, OCSDs, and ADHD. We review current literature to assess the state of knowledge about the neurocircuitry of OCSDs, CTDs, and ADHD, and their related sleep disturbances. Our review consistently implicates CSTC-pathway disruptions in OCSDs, CTDs, and ADHD, as well as dopamine and GABA dysregulation, primary neurotransmitters in CSTC circuitry, in sleep disorders. In addition, we highlight reports of subjective poor sleep and insomnia in adults with OCSDs, CTDs, and ADHD, and sleep movement disorders in adults with CTDs. The limited sleep research on youth with these conditions has demonstrated some similar findings. Unfortunately, much of the current research to date has not employed polysomnographic methods for objective sleep-related assessments. Future research should further clarify the neural association between these neuropsychiatric conditions and sleep disturbances to better guide potential therapeutic targets. Determining the most effective treatments for subjective sleep-related complaints in patients with these conditions will be crucial, particularly for determining treatment course-whether to prioritize treatment of the underlying condition, the specific sleep symptoms, or both simultaneously.