How can I get my almost 8 month old to sleep without being swaddled?

My 8 month old does not like to sleep unless she is swaddled! The only reason it's frustrating me is because she wakes herself up trying to get out of it, but then makes me reswaddle her, which is really frustrating at night, especially when it happens every other hour. What can I do to help her sleep without being swaddled?