Overtraining? Moi?

Yesterday's swim was awful. I couldn't go more than 100 yards at a time before getting exhausted. And for the second night in a row I've waken up at 2:30am for no reason and have had trouble getting back to sleep. I have suspected that I am approaching overtraining and these are the last straws. No hill ride this morning. No swimming tomorrow. Just one ten-mile ride this weekend. Time to plan some cycles in my cycling.