I have noticed my son's invouluntary movements --i have seen him do brief ones before but took not much notice and just thought he was being "restless", but last night seemed quite obvious, he woke up middle of the night and i got him to sit with me, he seems sometimes transfixed, gazed at the computer monitor and started moving his arms, a bit of legs, and some facial expression. He is very active, like any normal 2 year old, he is quite good with his balance and everything, being the 3rd child he is always doing the stuff his older siblings are doing, he always trying to keep up with them. He understands everything he is told, he follows instructions well, except when he is not getting what he wants he does tantrum. He just actually started talking now, putting a word or two together, but in comparison to his older siblings he seems a bit behind in speech. He is a happy little boy, loves to play and is very active. I am starting to worry, I cried last night when it actually dawned on me he was making the involuntary movements, he seems sensitive to light too, squints and covers his eyes when we turn lights on/ or if the sun is on him. It also seems to take him some time to find a comfotable position at bed time, he flips and flops around, moving his pillows here and there before falling asleep. I've seen him do the the involuntary movements when he is sort of half asleep or about to sleep.