The Baby-Backed Flip-Flop

I am mostly nursing at night now. Which basically means that I nurse when DD wakes up and I cant (read: haven't the energy to) coax her back to bed. Which means that I spend a lot of my sleeping hours getting sucked on. Now, usually, or at least this was the case with my DS and in the early days of DD, I'll decide when to switch them from one side to the other. Usually I do the switch when I'm tired of lying on that particular side and I need a change. Or sometimes it's because I feel the pressure in the other breast or else that the milk in breast 1 is running out.
What's cute is that DD now does the switching for me. I don't know what prompts it; whether it's the same reason as me, that she is uncomfortable lying on one side for so long, or if it's also because of a low milk supply on that side. Whatever the reason is, when she decides to go for breast 2, she will abandon the side she was nursing on and climb over me to lay her head on the other breast. She gives me a little head-butt if I'm not paying attention or if I am not getting her message. 'Aah, aah' she says and nudges me a bit to get me going.