To quote actor-writer-comedian Steve Martin: "A day without sunshine is like, you know, night."
Old man winter officially knocks down the seasonal door at 11:48 p.m. next Monday, December 21. The good news is that the days will start to get longer. The bad news: it will be three months before the days, once again, become longer than night.
If you are one of those Michiganders whose mood slides downhill as we slide into winter, you've got plenty of company. And it's all tied into the relationship among light, mood and melatonin.