So sorry you had such an awful night. Try to put it out of your mind as soon as possible. Look at reasons why you might be feeling anxious about your little son. It might be with all dreadful things that are in the news at present, about small children being abused and killed. There is usually something like that, which is there in your subconcious, which rears its head in even more graphic images, when you are asleep, and not in control in the same way as you are when you are awake. Please try not to dwell on it. Hope you have a better nights sleep tonight.