MrsC- I was exclusively on-demand feeding as of a few days ago, but Abby's schedule was still a little erratic and she would have her longest stretch of sleep smack dab in the middle of the day. I couldn't take it anymore.
So I've been waking her during the day to feed her and playing with her after she eats. I haven't been letting her sleep more than 2.5/3 hours. The first day & night were kind of rough, but last night she slept for 5 hours straight! And she actually seems quite a bit calmer during the day. It's more like I'm offering her food earlier than usual and keeping her satiated and happy!
I had a pretty anti-schedule mentality before this, but I go back to work on Tuesday and there's no way I could make it with so little sleep at night. I don't feel like it's too structured or anything and it's really helped make things more manageable!