Both parties are under the same conditions, so we must simply be self-aware. Evaluate your agreeableness on sunny mild days, and compensate by focusing on objective criteria such as your requirements. Seasonal Affective Disorder (SAD) the U.S. National Institute of Mental Health identifies this form a depression and its symptoms that start in the late fall or early winter and go away during the spring and summer; this is known as winter-pattern SAD or winter depression. Some negotiators may experience depressive episodes during the spring and summer months; this is called summer-pattern SAD or summer depression and is less common. Humans sometimes look at the trend of their last mental state and think that will continue, self-awareness is essential. Seeking professional help may increase self-awareness and negotiation performance.