In answer to your question yes there are 2 different SAD'S , they are saying in the latest research that all people who have SAD are also experiencing the opposite of the mood cycle the other months of the year (usually it does not rise to the level of hypo mania or mania but it can) there latest thoughts on SAD is you have to treat the entire mood cycle in order to combat the lows ( me being a skeptic and knowing far you much about big pharma bull crap, it sounds like a great way to sell people expensive medication by keeping them engaged in some kind of expensive doctor patient relationship , it's the gravy train for doctors and pharma companies reps ) there are a gizzilion bad drugs out there , that have either proved they are outright dangerous or have real potential and have not been around long enough yet to be shown in any kind of real negative light , the three worst groups of people are use car salesmen , auctioneers and drug company reps, 2 years ago they put the "sunshine act" in effect but that went nowhere near far enough in reining in big pharma, I apologize to anyone who is on medication and loves it and it has changed your life , as for me and my family and friends if there's a real nasty bizarre rare side effect , we get it , take for example "statins" for cholesterol , I tried them and was one of the first people to almost die from a then unusual and rare side effect, that now is seen frequently and recognized as statin intolerant, I have one rare muscle disease and one incredibly rare muscle disease (currently the only person on earth that has it )so to get a third one from a drug was really unwelcome, anyway it is very possible to have a reverse season SAD , bright photon therapy (light has been shown effective in many, and before you ask there is much more science and testing as well as successfull treatment with white light then the lower power blue light )and those with reverse SAD are advised to always wear dark glasses, and hats and stay out of the light during peak hours for the sun. Sorry to prattle on .