this. northern light technology is the one that you put on your desk as you're working the light hits you half an hour every day for about five days and you feel much better. a lot of herbals we have to get the patient feel better. >> the herbal and the light box, what else can you do, marc? >> it's not realistic. most people are not going to have the light treatment early in the morning. sit by windows. the first thing you want to do is recognize this. if you have are having a problem where you are gaining weight and feeling fatigued and no light out, spend more time by the window and spend more time outside, as much time outside as you can. exercise more. also, exercise actually increases the same hormones david was talking about that this decreases. so, exercise is key. get to your doctor and see whether you have another tendency for this. in other words, there's people out there that have other causes of depression, eric, but they get worse when you have seasonal effective disorder. so, on top of pre-existing depression, it can get worse. do you have a thyroid problem or