I live in NJ, zone 6 or 7, my plants spend the spring, summer, and fall outside, winter in an attached garage that gets close to freezing. Here I leave them outside until late October or November....they get a few frosts, but I bring them in before we get a really hard, prolonged freeze. Likewise, I have already put min outside, about a week or two ago, whilie it is still getting freezes at night but not a long hard freeze. They will wake up on their own. My garage doesn't have light of significance, but it doesn't matter when they are completely dormant.
I grow them in large, undrained pots. This works for me, but it is only one of several possible ways. Did your plants grow dormant, and you are only having problems now that they are beginning to grow? How much light is coming through those windows, is it just "birght" or is it full sun uninterupted by curtains, trees, etc.? How are the temps?