my son is 12 and is also ADHD and RSD. He started taking 1mg guanfacine 2 months ago. His crying fits went down a lot. He still want to cry about everything but is a bit more able to control it. He is taking 1 MG at night and 1 MG in the morning with his adderal. I make sure the night time is taken between 6:30 and 7 PM. He is sleeping better now and his behavior at school is also better. He have not complain of any side effects so far. I do not see any drowsiness issues with my son.