The goal of this study is test the hypothesis that sleep problems for children with ADHD are linked to sensory over-responsivity, a type of sensory processing difference that causes a person to interpret daily sensory input as stressful. This study examines the impact of sensory over-responsivity on bedtime arousal levels in 30 children with ADHD (ages 6-13). We will also test a bedtime intervention targeting sensory over-responsivity at bedtime and examine how it impacts bedtime arousal levels and sleep difficulties.

Following the consent process, baseline data collection will be completed electronically with questionnaires sent digitally to participants (parent and child) using a secure, web-based application (REDCap). Participants will then complete a virtual clinical baseline interview and training on the wear of the EmbracePlus ("watch") and the daily virtual sleep diary. Upon completion of this, the study team will then send the watch and its accessories to the participant via the mail.

Time point 1 home-based data collection (1 week): Once the caregiver and child receive the watch and study materials, home-based data collection will start. During this 1-week period, the child will wear the watch 24-hours/day for one week and the caregiver(s) will complete daily sleep diary entries (morning and evening). At the end of this data collection period, the study materials will be brought into the lab session.

Lab-based session (1-2 hours): Participants and caregivers will complete a training session on the environmental changes and a novel bedtime manipulation intervention called the "Power Down".

Time point 2 home-based data collection (2 weeks): Participants will apply any sleep environment changes identified during the lab session, complete the 'power down" each night, child will wear the watch 24hrs/day, and caregivers will complete daily sleep diaries (morning and evening). At the end of this timepoint, all study materials will be mailed back to the study team and a virtual exit interview will be completed. Final sleep and intervention acceptability questionnaires will be completed virtually.

Inclusion Criteria:

• Child aged 6-13 years
• A reported clinical diagnosis of ADHD or suspected ADHD and 6+ items endorsed as "quite a bit" or "very much" a single domain on SNAP-IV (ADHD symptomology questionnaire)
• Parents endorse >20 minutes to settle down and fall asleep
• Caregiver willing to participate in all bedtimes during intervention.
• Willing to come into the lab in Pittsburgh

Exclusion Criteria:

• Concurrent organic sleep disorder (sleep apnea, narcolepsy), psychiatric (major depression, bipolar, OCD, psychosis, schizophrenia)
• Current behavioral treatment for sleep disorder
• Unstable ADHD medication use (dose or timing)
• Children who have trauma or other histories for whom physical touch is triggering (per caregiver report) will be excluded.
• If a child spends bedtime at a different caregiver's home for >50% of the nights and that caregiver is not willing to participate in this study, the child will be excluded from this study.

The full study protocol and informed consent forms will be shared with interested researchers upon request. Only aggregate and de-identified data collected throughout the clinical trial will be shared.

Data will be available to share after publication of findings or 2 years after the end of the study, whichever comes first.

Data will be shared with researchers within and outside of the University of Pittsburgh through email requests to the lead principal investigator. The University of Pittsburgh may require a data use agreement be developed and signed by both institutions.