Seasonal Affective Disorder, also known as SAD, is a type of depression that happens during the same time each year. While it can happen at any time of year, it is most often associated with Fall and Winter (you've heard the term winter blues, right?) This is due to lack of sunlight which of course results in a Vitamin D deficiency. It's getting darker sooner, which throws off your internal clock, remaining indoors due to cooler or bad weather (hello cabin fever!) and what I call a "lack of an interesting landscape"; in other words everything lacks the color, vibrancy and fragrances of the warmer months. I'm bringing this up because in the last few days I kept remarking to my husband, "I feel so tired all the time," and "I feel like I have no energy," and wanting to eat every carb in sight. Personally, nothing has changed for me to bring this on. I'm very happily married, am passionate about my career, enjoy my sons and so on. He then brought it to my attention that since the weather has gotten colder, I've been outdoors less; it's getting darker earlier, etc. And then it clicked. During the days of getting my degree in Psychology, I had learned about SAD and recognized the symptoms.