S.A.D?

I've just read a description of the symptoms of S.A.D. and it sounds suspiciously like me.

Seriously. It can't be right to want to eat beef stew and dumplings and mashed potato and syrup-sponge every night, and I don't do it in the Summer.

And I won't even begin going over the sleep thing again. I already feel like it's all I ever talk about.

Hmnmm...

Can they test for it? You know, measure your seratonin levels or whatever? Isn't depression to do with your seratonin levels anyway? And if so, why are sun-lamps not the treatment for depression in general?