Inclusion Criteria:

• * child must be ages 3-5 years at intake
• * child with score of 30 on the Child Sleep Habits Survey-Short Form and a caregiver rating of child's sleep problems as moderate/severe
• * child with ≥80th percentile on the clinician-rated ADHD-RS based on age and sex norms, with at least 4 symptoms in the clinically significant range (scores of 2-3) in either the inattention or hyperactive/impulsive domains
• * parent/caregiver must have ability to speak, read, and write in English
• * parent/caregiver must have access to a device with internet and/or smartphone to access telehealth visits
• * parent/caregiver must have ability to follow written and verbal instructions
• * parent/caregiver must have ability and willingness to comply with study procedures.

Exclusion Criteria:

• * child with suspected obstructive sleep apnea or restless legs syndrome (via screening questionnaires)
• * child with current use of stimulant medication, other psychotropics, or medications for sleep (prescription or over-the-counter, including melatonin)
• * child with caregiver report of psychiatric disorder other than ADHD requiring treatment (medication and/or therapy), Autism Spectrum Disorder, or intellectual disability
• * parent/caregiver is currently participating in another parent training intervention or have previously participated in another parent training intervention in the past 6 months.
• * Severe and/or uncontrolled medical condition (e.g., pulmonary and neurological conditions such as cystic fibrosis and seizure disorder) that would interfere with sleep and/or study participation according to the study team