Good morning! My son has been on ADHD medication since 6 (now 12) and we are currently on a high dose of Concerta for daytime. Due to the same issues you are seeing with sleep—since he was a toddler actually, my son take 0.5mg of Rx Clonodine 1 hour before bed each night. He now also takes a 3mg melatonin . These medications are a life-saver for my son in that he is able to wind down easily and actually fall asleep and stay asleep. Mind you, they do not knock him out or anything! They just allow him to relax. Based on over 6 years of following this, I feel comfortable recommending you talk to with your MD about this! Good luck!