bringing in succlents for the winter

I do this and they get stringy, reaching for the light.

You should sign up for my Winterizing Succulents E-Course - it's free! If you're in a hurry, get the quick version: Overwintering Tender Succulents E-Course.

Keep in mind that most succulents thrive in bright conditions, so it stands to reason that they won't like being in dim situations like your house without some additional light.