Yeah, the sun goes down and so does my mood. I think that's one of the reasons it's worse for me in the winter.
It's difficult for me, but I find that if I can find something distracting and stimulating to do in the evening, my mood is much better. Just breaking the daily routine by making an excuse to go to a store or baking something for the next day -- anything but sitting and reading or watching TV. Sometimes I can get involved in some silliness on Facebook -- I don't mention my bipolar disorder there. Maybe we should start of list of things to do other than dwell

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I just take all my meds at bedtime, or maybe 15 minutes before. Once trazadone hits, I'm dizzy and nauseous if I'm still moving around. I haven't noticed that Lamictal affects my sleep one way or the other.