My daughter is 6 1/2 months and we're having the same problem! Some nights aren't too bad - just one feeding, and others are worse. The past few days she all of a sudden has been waking up for 3 feedings. I'm so tired, and my husband is out-of-town for quite awhile, so I've just gotten up and fed her so that I can go back to sleep. On top of that, she has started breaking out of her swaddle and so her naps have been terrible.
I would also love to hear others' advice. (Yes, I have read Tracy's book.)