Usually if an inquiry goes unanswered, a person might post "bump" to push the inquiry to the top of the queue where it may attract attention, and/or post a follow-up question which may help get a conversation started.

There is no guarantee that persons reading the forum in any given two-week period would have experience/expertise in the exact circumstances for which you are seeking assistance. The lack of a reply to your inquiry does not indicate anything negative about forum members.

Have you checked old forum threads about sleep?
Have you read the list of sleep resources on the Unisom website?
Have you talked with your child's pediatrician and/or psychologist/specialist/counselor/professional?
Is Unisom safe to give to a 12-year-old? Does the packaging contain any warning and/or dosage information regarding children?
Have you researched sleepwalking?