I am not someone who likes labels, and I think SAD is just a label...
yes, ppl feel different in the winter, but that's because it is cold and dark, we are encouraged to change our diets and eat more stodge, we fill our houses with central heating, we use lots of lights, we yearn for the spring, and later summer, so we can wear less, go out more... we are not in touch with winter- we try our best to avoid it, see it as something to survive beyond, but...
in the old days, BCh (before central heating), winter killed off the old, the sick, young babies, and this is why we all have a collective dislike of winter, I feel, and yes, it is probably why we all have our festivals- something to keep us psychologically warm in the bleak midwinter...
If you get seasonal effective disorder then food supplements such as
tryptophan or 5-HTP, or herbs such as ginseng or St Johns Wort could be utilised, depending on your predominant syptoms and previous medical history- all of which can be purchased in any health food store, and all of which are cheaper than swanky light boxes...
I am the type of person who does not work in winter- as soon as it gets too cold to get out of bed I remain inside my cat hair ridden duvet, rising at a sensible hour, such as noon, and trying my best to stay indoors until spring...this usually results in me being sacked, should I be employed.... I find that even in the UK it is simply too cold for me to go outside- I shiver so much my teeth chatter, and I cannot get warm... this though, is not related to depression- I simply don't like the cold...
in the old days, when ppl worked on the land, winter was a time to down tools, stop work, and sit at home eating pickled vegetables and salted beef... it was a time to stay indoors and get the house in order- cleaning, making clothes, preparing for spring, etc... you go outside you get wet, you get sick, you might die... why leave the house at all? but no!
The Man had changed all that.... now ur lucky if u get Xmas day and boxing day off... you are encouraged to buy decongestants and pain killers and struggle on working when u should be at home in bed, u eat food which wouldn't have been available to ur ancestors at this time, and u artifically try to control the temperature so we can collectively ignore winter...
then, because we are ignoring winter, and rationality, we get a bit miserable, and then we create a new condition, another suffering, and look for cures, when really, all we need to do is work less, eat better, wake up when its light, and go to bed when its dark... it's not rocket science...