I feel the same way. Especially out here in Southern California, where it is sunny all the time. This year has been especially bad for me with the change from Daylight Savings. That extra week of dark (from the official adjustment of the dates this year) was hard to get through.
I'm a little better now, but it still has been pretty rough. I'm finding it helps to turn on as many lights as possible at around 4:3pm. That way I have the extra light to prepare for dusk.