Feeling sad lately? As the days get shorter and colder, you may feel tired and moody, depleted of energy or enthusiasm. That sad feeling is officially known as SAD, or seasonal affective disorder, and it's quite common, especially in wintertime. Although experts aren’t sure, one theory is that the seasonal changes disrupt your body’s circadian rhythm, your body’s 24-hour internal clock … [Read more...] about The Ultimate Guide to Surviving the Winter Blues