Objective: The authors conducted a preliminary evaluation of a behavioral sleep intervention for children with attention-deficit/hyperactivity disorder (ADHD) and dyssomnia delivered via distance treatment. Method: Three children (1 male, 2 females; aged 6-10 years) with ADHD and dyssomnia participated in a 5-week manualized intervention. Using a non-concurrent multiple baseline design, the children were randomly assigned to a 1-, 2-, or 3-week baseline and then received the 5-week intervention. Sleep problems were assessed daily by both objective and subjective measures. Measures of problematic nighttime behaviors and daytime ADHD symptoms were also obtained weekly. Results: After 5 weeks, a clinically significant decrease was found in the severity of the children's dyssomnia. No changes in ADHD symptoms were noted. Gains were generally maintained at the 3-month follow-up. Parents perceived the intervention as being "helpful" to "very helpful." Conclusion: Based on the initial data, this intervention shows promise as an effective and feasible treatment. (Contains 3 figures.)