He has an addiction problem.
He gets through the day alright, but he's fooling everyone. As soon as he gets in the car to go home he starts chanting and rocking thinking about his soon-to-be fix. If we have to make a stop before we go home, he gets incredibly anxious and
When we get home, even though it's rarely above 35 degrees, he'll start stripping down outside before I even have the door unlocked. He rushes around inside with this mad look in his eyes and a slight tremor through his body while he puts all of his school gear away in the appropriate places.
Then without a glance backwards he is racing up the stairs to ease the withdrawal symptoms that have become increasingly unbearable throughout the day. His whole body loosens and that tense feeling disappears. He smiles and he laughs. He feels normal again.
He's playing with his trains.