Winter blues

I admit it isn't really winter yet but it is cold, dark, wet and miserable. I keep procrastinating about work and would like nothing better than to spend a few days just wrapped in a duvet in front of the TV with a good book (shades of Martine McCutcheon in a recent TV ad for fabric softener). Last week my doctor asked me if I was a summer or winter person. It's not a question that I had ever seriously considered before, because I don't really feel comfortable in any extreme of weather, hot or cold, but as soon as she said it I realised that my mood had definitely dropped when the weather changed so suddenly this autumn and the days became shorter. So perhaps I actually do suffer from SAD?