Girls, help! What could it be? We're almost at 9 months and my child h…

Girls, help! What could it be? We're almost at 9 months and my child has started running in his sleep. It happens a few minutes after he falls asleep. He lies on his back, and then suddenly starts kicking his legs as if he's running. Then everything goes back to normal. It scares me a lot, it looks like convulsions, but we saw a neurologist very recently and everything was fine. But now, for the past 3 days, every time he falls asleep this happens.