Some people use artificial light to trick their body into thinking there is more sunlight. And yes, it can follow that one is manic in the spring and depressed in the winter. Its not always that way- I've had manic episodes that were not in the spring (though my last one was). No, I have not moved. However a friend of mine moved from New Hampshire to Florida and her physical symptoms got a great deal better. She is not bipolar, however.