Are you one of many Vancouverites that feel great during the summer, but dread the rainy, dark fall and winter? For many people, decreased light levels mean lower energy, depression, oversleeping, overeating, and carbohydrate cravings. It is thought that imbalances in melatonin, cortisol, vitamin D, and various neurotransmitters are responsible for this condition, known as seasonal affective disorder (SAD).