I tried searching for this problem but couldn't really get to anything, so posting here. Whenever I am very excited or go to a new place, I cannot fall asleep. But that sounds normal, however sometimes, when I am very much involved in doing something and do it for several hours, and when I sleep, I can fall asleep but I keep getting in dreams what I have been doing. For example, if I play a computer game, that keeps repeating in the dreams. Some times I end up getting facebook or even math in my dreams. The same thing just repeats on and on and on and its very frustrating. As a result I keep waking up many times.
I never got it diagnosed (never saw a point) but I feel like I have symptoms of ADD. Most of the time I cannot concentrate well, keep switching around and stuff like that but when I am into something, the concentration is intense. That may be great, but I can't sleep well that night. Yesterday was one of them.
I know drinking chamomile tea or relaxing might help, but I never know when this thing is going to happen.