Hello, I too have a hard time sleeping. I've had RSD for 7 1/2 years now and it's to the point where I need my normal meds to be able to actually "fall asleep".
But if I don't have those, I do take an herbal supplement called "Valerian" that relaxes me. But one thing, because it's so cold where you are - you will need to adjust your body to that. RSD loves the cold and loves it so much it wants to share it and spread it to the rest of your body.
So even if you are having trouble sleeping, make sure you keep your body (especially the RSD effected) areas. Wearing yourself out is easy too, especially for us RSD heads, our body get so worn out, but don't push yourself. Your body will eventually fall asleep.