JennF I don't personally d/f, but DS does cluster feed sometimes. Just had a look in TBW secrets of the BW page 184-5 and Tracey has this advise for you....
Tank them up. This might sound like a rather crude expression, but one of the ways we get babies to sleep through the night is by filling their tummies. To that end, when an infant is six weeks old, I suggest two practices:
cluster feeding—that is, feed her every two hours before bedtime—and giving what I call a dream feed right before you retire to bed. For example, you give her the breast (or a bottle) at six and eight in the evening, and the dream feed at ten-thirty or eleven.
With dream feeding, literally nurse or bottle-feed). her in her sleep. In other words, you pick your baby up, gently place the bottle or breast on her lower lip, and allow her to eat, taking care not to wake her. When she’s finished, you don’t even burp her; just put her down. Infants are usually so relaxed at these feeds, they don’t gulp air. You don’t talk; you don’t change her unless the night she’s soaked through or soiled. With both these tanking-up techniques, most babies can sleep through that middle-of-the-night it, teach feed, because they have enough calories to keep them going for are some five or six hours.
HTH (sorry if there are words missed out, I scanned it from the book for you, tend to miss word it doesn't understand)
lauren x