It usually starts with his left arm and he will raise it slowly like he is getting something out of the air. Then he will bring the other arm up to meet it. Usually he will then put his two hands together and bring them down and look as if he is doing something like threading a needle or probably to him something to do with fishing.
This happens within a few minutes of falling asleep but he isn't breathing like he is sleeping.
Sometimes he will move his hands to his mouth like he is eating a something. Then move his hands back and work some more and then bring his hand back to his mouth to eat.
Is this dream related? when he hasn't even been asleep long enough to dream yet?