Today is Monday, December 19th- It IS - Holly Day, Oatmeal Muffins Day, Hard Candy Day A study found that singing Christmas carols together is good for you- releases feel-good hormones, helps you bond with people, and just lifts your spirits. New national poll says it's OK to do it at your parents house over the holidays if you're traveling 12% of us will eat in a restaurant on Christmas Day. Some of the the biggest…