It's only the 7th and I'm already slipping into a seasonal depression. At least I'm taking my vitamin D and I've got most of the Christmas shopping done. So far it's manifesting as glumness and a desire to spends heaps of money on myself on Amazon. And grouchiness and a burning desire to bitch about my childhood. I'll try to curb that one.
It's good to be old enough to recognize these mood swings for what they are, and to know that they'll pass.