From time to time all of us see nightmares. And it is absolutely okay. Usually we have nightmares because of problems and stresses in life. It is simply inevitable. But when you have nightmares too often it can be disturbing. You would feel devastated and exhausted. It may cause some serious emotional problems including depression. Pay attention to it. It is a sign you should take actions.
First of all you should try to understand what reasons could trigger bad dreams. Our dreams reflect our worries. Usually it happens so. Try to change your attitude to the situation. Of course it depends on the situation. But if it is a symptom of stress then you should relax and get rid of negative feelings. The easiest way is to go to bed. But if you see bad dreams it would hardly help you. No doubts you would be more disturbed and irritated. It is recommended to go for a walk before sleeping. It would be much better for you and much more helpful to meditate or do yoga.