Seasonal Affective Disorder (SAD) is a seasonal type of depression that starts when the seasons change. When the winter starts to set in, the shorter days and less sunlight make some people feel lethargic and depressed. Other symptoms from the condition may also include changes in weight, insomnia and chronic fatigue. "The lack of sunlight increases the body’s production of a body chemical called melatonin. Melatonin is what helps regulate sleep and can cause symptoms of depression," the Mayo Clinic reported. How can a person bounce back from SAD which begins and ends at the same time every year? Most people suffering from SAD are not in the mood to take action as they are mentally and physically drained. However, you need to make a move if you are going to bounce back from SAD. Here are 5 ways to get you started.