It's a bit like the moro reflex when he was a baby, but this only started a few days ago at night and today was the first time it affected him going to sleep for a nap. When we put a hand on him to steady him he goes back to sleep quite quickly but then jerks himself awake again a couple of minutes later. It took almost an hour of him going to sleep/jerking himself awake to actually get him off to sleep properly today. Has anyone else had similar experiences?