I did manage to get in two more one-hour sessions this weekend, which brings me to three - just need seven more of those by September 30, along with 7 more other sessions of at least 30 minutes.
One thing that's been helping me is getting to bed early. This summer, when I was on a very light work schedule, I found myself staying up until one or two in the morning some nights watching stupid television. Maybe I just needed to get it out of my system. But I've been working really hard to get to bed by 9:30 on the nights when I have to either be attentive to my daughter or get to work early the next morning. If I can get to bed then, I can get up at 5:30 and squeeze in 30-60 minutes of writing easily before I need to face my other responsibilities.