Ain't no sunshine when she's gone...

Anyone else have a problem being motivated on cloudy, dreary, cool days? I got up this morning for the Bible study I lead at one of the middle schools with every intention of going to the gym afterwards...Instead I went back to the house and slept for an hour. Now I am sitting here in the office struggling just to stay awake and be motivated. Anyone else get this way when the sun doesn't seem to want to come out?