I'm not sure why I get so sentimental this time of year, but I do. I get ridiculously nostalgic and highly emotional. I look at my children, I get weepy. I hear a Christmas song, I get weepy. I see a Hallmark commercial, I weep uncontrollably. So on the fifth day of Christmas, I was on the verge of tears all day. The day started with a Skype call from a dear friend in Cambodia, a request from another to join her in some holiday fun, and a message from yet another that she would be doing …