I definitely think there is something to SAD. As with many things some people are more affected than others by environment. I used to feel very out of sorts in the winter when I was a kid, especially around 4-6 pm it was very uncomfortable. I have found that plenty of plants, and definitely a fountain (those table-top ones are really nice...the ones that make noise I think are better) helps my DD and even me. She also likes some sort of tent in the l.r. with blankets and flashlights. Twinkle/holiday lights here and there are good - we even have them in the kitchen and on the mantle in the l.r. This is nice for that dusk time or dark cloudly days.
I've thought about those special lamps. They're expensive but might be worth it.
If you live near a botanical gardens w/ indoor-tropical areas, or a zoo with a rainforest, a weekly visit there w/ membership is really great.
