It may have been a fluke, but last night the baby slept from 9 until 6:30 without asking to nurse! *and here I am doing the happy-I-got-some-sleep dance* Awe, she's growing up so fast.
I also woke up about 15 minutes before she did, completely awake and feeling more rested than usual. Therefore, it seems that 6 hours of uninterrupted sleep = 7 hours of nursing and sleeping sleep. Oh, I will be relishing this joy all day. Here is a pic of my little fatty: