Thank you for your suggestions and support regarding Vivian's sleep schedule (or lack thereof). In general, things are getting better. She's getting hungrier, which may have been why she kept waking up -- we just weren't feeding her enough. So we've increased how much we're feeding her, and she's sleeping better. Although last night, she fussed and cried from 2 a.m. - 5:00 a.m. -- awesome!
But today, we took a bath, and I just looked at her big blue eyes, and realized that she is everything I've ever wanted. She's perfect. So what if she's a bit fussy?