Keep a journal:

A journal makes you more aware of what you're doing and where problems might be coming from because you can document anything. If you spend time documenting the little things, like food intake, water intake, or sleep, you might notice a larger trend that you can correct for. If you're looking for a deeper understanding of your decision making skills, Harvard Business Review suggests writing down what you think will happen with a decision, then wait nine or ten months and review what you wrote.