Do you suffer from seasonal depressive disorder? Does it have anything to do with Asperger?
I kind of get a bit depressed in the evenings, but not in the winter. Then again, the winter here isn't much. We get plenty of sunshine even in January. Started to get depressed at the sight of the sunset as a child, but maybe it was because the day was close to over, and I knew I'd had to go to school the next day, and it became a habit...