The other option, if you are not already doing it, is to have a CD on in their room that is on repeat.......this often breaks the cycle of this type of waking. (I am pretty sure Pinky mentions it in her book too)

I have used the same CD on repeat for Olivia and Charlie and now Lexie. I can hear Lexie give a grizzle about 35 mins after her last evening feed........through the monitor.....so she still "wakes" but within seconds, the grizzling stops and she is back to a sound sleep again........

I use Peacebaby, which again is one that Pinky recommends. I love it. I have heard it a zillion times and I think I now naturally associate it with sleep too!!