I've been trying to get a picture of Anna doing this for a couple of weeks now. I caught her doing it in her crib when she wasn't napping in the morning and then it was a favored position to try to get to sleep while experiencing jet lag in Paris. So, I'm not sure if it's just a fun position or if it has something to do with her feeling a little sleepy; perhaps it is a little bit of both.
This is a great picture!