This sounds a lot like my 7 year old son who has severe ADHD and he is becoming much more anxious. With the stimulant meds that he takes we finally had to introduce Clonidine every evening, it helps a lot with him going to sleep, but he still wakes up from time to time. I would say that his sleep quality has improved for both of us though. He was very tired every morning until we started this. He has been taking it for about 6 months and he takes .2 mg tablet in the evening about 30 minutes before his bedtime.